car turn signals

Why do car turn signals click?

When you turn your car left or right you hear the familiar click-click sound from the turn signal. At the same time the arrow on the dashboard flashes to show the signal is working.

Even though cars have become much more advanced this sound has stayed the same for many years. But have you ever wondered why?

Turn signals first appeared in cars in the late 1930s. In older vehicles the clicking sound came from a thermal flasher.

When the driver switched on the turn signal electricity heated a small metal strip.  As it bent from the heat it completed an electrical circuit and turned the signal lights on.

The metal quickly cooled returned to its original shape and broke the circuit turning the lights off.

This heating and cooling cycle repeated over and over making the lights flash. The movement of the metal strip created the well known clicking sound.

As technology improved car makers replaced the old thermal system with electromagnetic and later electronic systems controlled by computer chips.  These newer systems no longer need moving metal parts to flash the lights.

However most modern cars still play the click click sound on purpose.

Manufacturers keep it because drivers are used to hearing it and the sound reassures them that the turn signal is working correctly even though it is no longer mechanically necessary.

Similar Posts

  • Pumpkin seeds for glowing skin

    Pumpkin seeds are well known for their health benefits but they may also support healthy looking skin.  They contain nutrients such as zinc vitamin E and antioxidants that can help protect the skin from damage. Benefits of pumpkin seeds for skin Pumpkin seeds contain antioxidants that help protect skin cells from harmful free radicals.  Their nutrients may also support healthy skin as it ages. They are also a source of vitamin E which helps protect the skin from environmental damage and supports its natural barrier. Pumpkin seed oil can provide moisture and may help make dry skin feel softer and smoother. The nutrients in pumpkin seeds may also support normal hormone function which can be helpful for overall skin health.  However pumpkin seeds should not be considered a treatment for hormonal skin problems. Pumpkin seed face cleanser You can make a simple homemade cleanser using pumpkin seeds. Ingredients. •1 cup pumpkin seeds •½ cup honey •1 tablespoon sandalwood powder •1 tablespoon nutmeg powder Method Grind the pumpkin seeds into a fine powder. Add honey, sandalwood powder and nutmeg powder then mix well.  Apply a small amount to the face gently and wash it off with water. Pumpkin seed scrub Pumpkin seeds can also be used in a homemade face scrub. How to make it Boil some pumpkin pieces and pumpkin seeds in water. Strain them and blend the pumpkin and seeds into a smooth paste. Add 2 tablespoons of honey and 1 tablespoon of cinnamon powder.  Apply the mixture to your face and leave it for about 10 minutes. Then gently massage in circular movements and rinse with water. This mixture can also be used on other areas of the body but avoid harsh rubbing. Simple pumpkin seed face pack Another easy option is to mix ½ teaspoon of finely ground pumpkin seeds with ½ teaspoon of honey.  Apply a thin layer to the face and let it dry. Rinse gently with lukewarm water. You can also mix pumpkin seed powder with a small amount of almond oil to make a simple moisturizing face pack. Use with care Natural ingredients do not work the same way for everyone. Pumpkin seeds, honey cinnamon nutmeg or other ingredients may cause irritation or an allergic reaction in some people. Always do a small patch test before applying a homemade mixture to your face.  If you have sensitive skin or known allergies it is better to ask a doctor or dermatologist before trying new skin treatments. Pumpkin seeds can be part of a healthy diet but there is limited scientific evidence that homemade pumpkin seed treatments can dramatically change the skin within a few days.

  • The jaded gender talks

     By Saman Aftab We are so habitual of listening to the gender inequality, women empowerment, and ever growing population talks that now these topics have become an essential subject for the matter of discussing societal issues. But what we people have lacked to unravel is the very essence of these debates. Why gender inequality exists? Why we are still lagging behind in terms of employing more women? Why we are unable to control the growing rate of population in our country? Before addressing the ‘absolutely unavoidable’ questions, let me take the readers down an irksome memory lane of my life. Last year when our maid broke the news of her pregnancy to us, our most obvious question was why now? Considering her age which was 42 years that time and her financial grim along with unsupportive role of her husband in bearing the burden of their five children, this question clicked in every mind. And her answer though not surprising was quite gloomy for the existence of every female in this world; “baji, larka chahye humen” (we need a boy). She had four daughters and a deaf son. Her statement broke my heart because it questioned the capabilities of her daughters who were all physically and mentally sound. This memory was not worth forgetting because as a female it made me feel inferior. But this Babygirl vs Babyboy thing is not new, in fact it is one of the most deeply rooted concerns of our society. The normalcy of demanding the birth of a boy from a married woman is consolidating with the passage of time. The worst part of this matter – it’s getting acceptance. Ironically, majority of mothers in law showcase such demands to the newly married couple, as if it is in their hands to ‘design’ the genetic make-up of their offspring. The heart wrenching memory got afresh, when Tabassum shared her so called good news with us. Tabassum, 35 years old woman who works as a maid in three houses, a mother of four girls is expecting again for the sake of receiving a son this time. Her good news reminded me of her last fourth delivery when she gave birth to a girl in government hospital and she was made to give her daughter to a rich family on the persuasion of her drug addict husband. Whether they got money in return was dubious but chances of such happening were bright. I really hope and pray that this time she gets a son, otherwise the couple will continue to bring unwanted girls in this world and ruin their lives. For all the existing daughters of this couple are living a dark and disowned life. This brutal reality of life is not constrained to lower class people and it has crossed the demarcation of social groupings based on all classes, religions and races. Let us take an example of my sister’s friend, who is married to a well-established businessman and living in a posh locality. The poor lady who has a rich family, is a mother of two cute little girls. Although the little girls born to riches are living a good life, their mother is undergoing severe mental anxiety and pressure for not having a son. And of course, she for the sake of getting rid of such pressure is planning to have another baby neglecting her present deteriorating health condition. Unfortunately, the instances are innumerable and the rate of their occurrences is increasing day by day. Why boy child is mostly preferred over girl child? The answer lies in the heart of several burdens tied with bringing up a girl till her marriage. Among so many liabilities, the extra protection needed by the girls in our society and the curse of dowry have aggravated the scenario to such an extent that today girls are seen as “misfortune”. Of course exceptions are always there. Let us shift the focus from this melancholy to addressing those “absolutely unavoidable” questions raised earlier. 1: Gender inequality; Homo sapiens (humans) are generally categorized into three groups namely man, woman and transgender. Men are always ranked superior for enormous reasons but if we see things more pragmatically, it becomes evident that parents are left with sons in their old age while their daughters somehow abandon them and serve in laws for the rest of their lives. Call it our family system, it is the way it is. Then how can girls be loved or demanded? For voicing rights for equality, women should also bear the responsibilities equally. If a woman is capable of doing an employment being educated or skilled, she must pursue it for sake of giving all the best of resources to her parents that are expected of a son. The root cause of inequality among genders is the leverage given to men of being more useful and thus more needed. As long as the share of women in the society is constrained only to domestic chores and family caretaking, this inequality will never fade away. More women should be encouraged to become financially sufficient and independent. But how? This leads to our second question. 2: Women empowerment; there should be more campaigning with regards to educating girls and investing in their skill building. More powerful the educational background of a woman is, more will be the chances of her getting a good job for the sake of financial security. Thus, the number of women working for the betterment of society and raising capital will rise exponentially. And finally once these two milestones are achieved, the third ordeal of our country will evade automatically. 3: Overpopulation: as discussed in the start, demand and desire for the birth of a son has contributed a lot more towards overpopulation. Men are expected to take care of their parents but the same goes for women also. And in this age of compatibility, women should come forward and play a vital part in developing this society. Instead of placing all the

  • | | |

    Benjamin Franklin’s iconic ‘Join, or Die’ cartoon

    In Philadelphia, a new public artwork inspired by Benjamin Franklin’s famous “Join, or Die” woodcut is being installed on Independence Mall. Designed by artist John Collins, the impressive 46-foot-long granite sculpture is slated for its official public unveiling later this autumn on the Liberty Bell Center Block, right in the historic heart of the city. From 18th-Century Print to 21st-Century Granite The original artwork that inspired this modern installation carries significant historical weight. On May 9, 1754, Franklin published the illustration in his newspaper, the Pennsylvania Gazette, as the French and Indian War was breaking out. Created as a woodcut print, the imagery depicted a serpent severed into eight distinct segments, directly above the stark warning “JOIN, or DIE.” A Collection of American Colonies Each section of the snake was carved with initials symbolizing the American colonies of the era. N.E. (New England, grouped as one block) N.Y. (New York) N.J. (New Jersey) P. (Pennsylvania) M. (Maryland) V. (Virginia) N.C. (North Carolina) S.C. (South Carolina) At the moment he published the print, Franklin was preparing for the Albany Congress. This critical meeting brought colonial delegates together to strategize against common external threats and to negotiate a vital alliance treaty with the Iroquois Confederacy. Strength Lies in Solidarity. The cartoon served as an urgent call for collective action, warning that a fragmented collection of colonies would inevitably perish individually. “The confidence of the French in this undertaking seems well-grounded on the present disunited state of the British Colonies, and the extreme difficulty of bringing so many different governments and assemblies to agree in any speedy and effectual measures for our common defence and security,” A Lasting Legacy of American Unity   By translating this historic woodcut into a physical, segmented granite monument, the National Park Service and artist John Collins aim to give visitors an interactive connection to early American history. Set against the backdrop of Independence Hall and the Liberty Bell, the 46-foot sculpture preserves Franklin’s message: strength lies in solidarity.

  • Blood treatment removes forever chemicals

    A new study suggests that a blood cleaning treatment used to lower cholesterol may also help remove harmful “forever chemicals” from the body. The treatment called apheresis is mainly used for people whose high cholesterol cannot be controlled with medication.  During the procedure blood is taken from one arm and passed through a special filter that removes excess fats. The cleaned blood is then returned to the body through the other arm. At the Technical University of Dresden in Germany, home to one of the world’s largest apheresis centers around 10,000 of these treatments are performed each year. For the study researchers examined used filter bags from the apheresis machines to see what substances had been removed along with cholesterol. They wanted to find out whether the filters could also remove harmful forever chemicals toxic substances that remain in the environment and the human body for a very long time as well as tiny plastic particles known as microplastics. The researchers say the early findings are promising. If future studies confirm these results apheresis could become a useful way to reduce the amount of certain harmful pollutants in the body in addition to lowering cholesterol.

  • |

    Mill’s “On Liberty” in the era of censorship

    In his 1859 political treatise On Liberty, Victorian philosopher John Stuart Mill issued this timeless warning. The greatest threat to humanity is not monarchical despotism, but the tyranny of the majority enforced through state power. The Harm Principle At the heart of Mill’s philosophy lies the Harm Principle. The radical assertion that authority can only be legitimately exercised over a member of a civilized community against their will to prevent harm to others. Beyond this minimal threshold, individual autonomy over mind, body, and speech must remain absolute. Re-reading Mill today reveals a truth. His warnings are no longer abstract political theory. They provide a precise mirror for contemporary state overreach. This overreach is illustrated by the erosion of civil liberties in Indian-administered Kashmir and the systemic suppression of media outlets like Al Jazeera. The Harm Principle and the Disfranchisement of Kashmir Mill argued that suppressing individual self-determination degrades both the citizen and the state. In Kashmir, the unilateral revocation of constitutional autonomy, prolonged blackouts, and detentions of political leaders represent a case of majoritarian coercion. A state strips millions of their basic political rights under the justification of order or national integration. So, it violates the core of Millian liberty: consent and self-governance. Mill cautioned against treating entire populations as passive subjects incapable of directing their own political destiny. By denying Kashmiris the freedom to assembly, political self-expression, and uninhibited digital communication, state machinery replaces organic democratic engagement with enforced compliance. In Mill’s framework, a government that fears the peaceful political expression of its people reveals the fragility of its own moral authority. Ban on Al Jazeera Mill’s second chapter, dedicated to freedom of thought provides the intellectual critique of state censorship. He argued that silencing an opinion is a unique crime against humanity because it presumes the state possesses infallibility. Even if an perspective is deemed antagonistic, banning it deprives the public of testing truth against error. This principle directly challenges the recent enforcement of the Al Jazeera Law, under which the Israeli government shut down the Qatari broadcaster’s local operations, confiscated equipment, and blocked access to its platforms. Citing national security threats, state authorities effectively declared themselves the sole arbiters of acceptable news coverage. Mill would argue that invoking national security to silence reporting—especially during conflicts where independent oversight is most vital—is a classic instrument of state self-protection, not public safety. When a state decides which facts citizens and the international community are allowed to hear, it undermines the very foundation of a free society. Why Mill Matters Today   On Liberty remains an indispensable framework because it demonstrates that liberty is not a luxury granted by governments, but an essential condition for truth and justice. Whether in the militarized silence enforced upon Kashmir or the legislative bans silencing journalists, the modern state increasingly employs legal mechanisms to enforce conformity. Mill reminds us that a society that trades fundamental liberties for state-defined security ultimately preserves neither.

  • Whitening creams may damage your skin

    Many people use skin whitening creams and bleaching products to make their skin look lighter and brighter. While these products may change skin tone for a short time experts say they can cause serious skin problems if used for a long period. In Pakistan and many other Asian countries skin lightening creams are widely used. Many people buy and use these products without first talking to a dermatologist. According to skin experts many whitening creams contain strong chemicals and steroids. These ingredients can make the skin appear lighter for a while but they may also damage the skin over time and lead to long lasting problems. One common side effect is acne. Experts say corticosteroids found in some creams can make the skin look smooth at first but continued use may trigger pimples. These pimples can later leave permanent dark marks or scars. This problem can affect both men and women. Some whitening creams also contain hydroquinone. Research suggests that using hydroquinone for a long time may cause a condition called exogenous ochronosis. This condition leads to blue or dark patches on the skin especially in people with sensitive skin. These marks can be difficult to hide even with makeup. Another possible risk is dermatitis a skin condition that causes irritation and inflammation. It may lead to redness itching, swelling, dry skin, rashes blisters and in severe cases painful sores. Dermatologists advise stopping the use of any whitening cream if you notice redness itching swelling unusual spots or other skin changes. They recommend seeking advice from a qualified skin specialist instead of relying on products that promise quick results. Protecting your skin and following professional medical advice is a safer and healthier choice.

Leave a Reply

Your email address will not be published. Required fields are marked *