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How does hair know when to stop growing?

Hair does not know how long they have to grow.

But they have a finite lifetime. After that they stop growing and they fall out. Also new hair is allways growing. The equilibrium is the terminal length where you think hair is no longer growing.

Bodyhair has a much lower liftetime than head hair, that is why eyebrows are shorter than the hair on head.

If you don’t cut your hair it will also reach a terminal length and it will look like its not growing anymore.

Since the Coca Cola recipe is a secret, isn’t it illegal to not list all the ingredients for a product?

They do list ingredients, as required by (U.S.) law.


But the law does not require them to spell out exactly what all those “natural flavors” are, nor the exact proportions, nor the processes they put the ingredients through – for Coca-Cola, or anything else.

The more interesting case is wine, which does not have to list ingredients in the U.S., as the law contains an exemption for wine.


What makes a substance greasy or sticky on a molecular level?

When thinking about things being sticky or slick it’s useful to think of the molecules as tiny little robots with magnetic grabber arms. Some materials have lots of arms and connect to each other well. Some materials have very few arms and don’t have a strong connection.  Some materials have the wrong kind of connectors for each other and don’t have a connection at all, in fact they push each other apart.

Sticky things like tape, glue, snot and honey are all made up of little parts, molecules, that have a lot of grabber arms. They are also really good at getting into all the little nooks and crannies of what it’s trying to stick to.

Slick or oily things like grease, lubricants and ice don’t grab on to other things as well as sticky things because they have fewer arms and don’t do a good job of making contact with the other surface.

This is why pressing on things helps to make them stick better. You are forcing more of the two things to touch, getting into all the little bits of the surface. You also add energy by pressing which can cause things like forcing more grabber arms to activate.

Important Things You Should Know About Car Covers

Car covers are good investment for protecting your car especially if you are not using it. They work well in protecting your car from dirt, rain, UV rays among many other pollutants. Below is a set of frequently asked questions on car covers that might help you understand more about them and make a good decision.

Q: What is the importance of a car cover on my car?

A: There could be a hundred answers to this question but these are the basic ones. Car covers protect your car from UV rays, dust, dirt, scratches, animal droppings, tree sap. In addition, car covers protect your car from harsh weather conditions. Ice could cause fatal damage to your car’s finish. This is why a car cover should be used whenever you park your car outside. Animals like squirrels and cats love to play on cars. They, therefore, leave scratches on your car’s finish. If you can’t prevent them from damaging your car then simply use a cover.

Q: What is the best car cover?

A: This depends purely on your budget and the type of car cover you would want. Nevertheless, a car cover that has a soft finish is the best. Mostly, non-woven polyesters are known to have a soft finish. Good car covers have multiple layers of heavy fabric. This allows breathability and it is harder to have scratches on your car. We advocate for a heavy material rather than a lighter one. Lighter materials keep wrapping around in windy areas. Woven materials are disregarded due to abrasion. However, you should note that not all woven are similar.

Q: Should I invest in customized covers or universal covers?

A: Customized covers are the best compared to universal ones. Though the custom fit is a little bit pricey, it is simply a worthy investment. Nonetheless, there are universal covers that are of good quality and you can find a good fit. If you are searching an inexpensive cover then the universal cover is fine. If you choose to buy a universal cover then you need to choose a slightly larger one rather than a slightly smaller one. We recommend that you choose the customized one especially if your car is of high value.

Q: Can a car cover prevent my car from buglers and thieves?

A: Yes. Thieves and burglars are afraid of being caught and they hope to take the shortest time to steal. A car cover takes some minutes to remove. No thief will attempt to start removing the cover and risk being found. A cover prevents the valuables inside your car from exposure to burglars. If your valuables are covered, no thief will be tempted to steal.

Q: How do I store my car cover correctly?

A: Mostly, car covers come with durable carriers that you can use to store your car cover. Make sure that you fold your cover rather than rounding it up. The bag protects it from dust and dampness. Folding it up will help you fix it anywhere. Storing your cover properly will ensure that your cover will also last long.

Q: How regularly should I wash my car cover?

A: Your car cover is a lot more like your clothes. A car cover is exposed to dirt and dust and hence it will need a regular washing. When washing, be sure to read and understand the washing instructions. Drying will not be a heavy task; you will only need to place it over your car. Apart from washing it regularly, repair the torn areas as soon as they happen. Taking regular care of your car cover will let it serve you longer.

Q: Can I protect my car cover from theft?

A: Yes you can. Some of these car covers are a little expensive. It will be a great loss if it is stolen. Fortunately, when you purchase your car cover, you will be given a cable and a lock pack. After placing your cover well, then use the provided cable and lock to secure it.

Q: How best do I uninstall my cover from the car?

A: Fold your cover well such that you will not have a hard time reinstalling it. Bring all the four sides of the cover on top of the car in two folding. Fold them again two to three times folding. Folding it in this manner will ensure a good angle to store and reinstall it. Make sure that you do not let it fall on dirt.

Would you like to know more about car covers? So please click here for more info.

Why is sore throat a symptom of many common sicknesses?

Your body is a castle. Germs are invaders. Your castle has thick walls but needs gates so you can see out of it, take in supplies and get rid of rubbish.

Gates are weak spots so get attacked more often. The throat is the most open to attack as it is moist, warm and we are constantly moving air (containing viruses/bacteria), food which we have touched with our dirty hands etc. across it.

The throat releases chemicals to make it swell up to deliver more blood (and therefore more infection fighting cells, nutrients etc.) to the site of attack. Swelling causes pain, presumably to make us go easy on parts of the body which are under attack.

Why do tablets sometimes feel like they are stuck in our throat after swallowing?

They’re kind of stuck. They’ll keep moving down your throat but that feeling means that the pill hit the walls of your esophagus when they were too dry so it’s harder for the esophagus to move the pill down.

Think of it like trying to go down a water slide. If the slide is wet you don’t get stuck and go very fast. If the slide is dry your skin creates friction and you go slow or get stuck. You need that lubrication of the water to go down fast.

If it’s a common issue for you try taking pills with a bigger sip of water. Let the pill float in your mouth for a second in the water then swallow.

Why does a laser pointer have a grainy pattern in the beam?

The light from a laser is coherent, all the waves of the same wavelength, color, and all in exact lockstep with one another. When the beam strikes a surface and bounces off and the wavefronts collide with one another and can reinforce and/or cancel one another.

The sparkle pattern of a laser can be compared to the choppy surface of a lake on a windy day as waves cancel and reinforce one another to the extent that no regular pattern of waves can be seen.

Why do many workplace PCs still run on old software?

A few reasons:

1.  Cost. Upgrading software is expensive.  If an upgraded licence costs $50 that may not seem like much, but doing that for 5,000 machines gets really expensive really quickly. 

2.  Compatibility. Very often, companies will have custom or specialized software that may not function well with newer software.  If the older software doesn’t have patches/upgrades, or those patches/upgrades are not cost effective (see point 1) you may need to keep other software downgraded in order to preserve compatibility.

3.  Security/Reliabilty. Older software – particularly in the enterprise – can be more secure and/or stable because the bugs and security holes have been patched. Newer software may introduce newer bugs that can compromise operations.

4. Usability. Not everyone is computer literate in a company and upgrading their software may confuse them to the point where they struggle to do their job until they learn the new software.

What is the difference between economic recession and depression?

An economic depression is a form of a recession. A recession is determined as two or more consecutive quarters of negative GDP growth; while a depression would be measured in years and not quarters.

In the Great Recession, the United States experienced 6 quarters of negative GDP growth (3rd quarter 2008 to 1st quarter 2010) so it was more than a simple recession but it did not quite meet the standard for a “depression” as we were only in a recession for about a year and half.

Had they been in official recession for say 8 quarters or more (there are four quarters in a year), a conversation could have been had whether it was a depression instead of just a recession.

Some argue that they were in a depression; however, the stigma associated with the Great Depression provides that the term is only used as a last resort. No government wants to admit they are in a depression as that word is automatically associated with the hardship of the early 30s.

How do chicken eggs not crack inside their body?

Eggs can crack inside the hen, but it’s not common because eggs are actually pretty strong when forces are applied evenly over the entire shell.

If you wrap your whole hand around an egg trying to make as much surface contact as possible, it’s actually pretty difficult to break the egg by squeezing it. If you pinch the egg between two fingertips, it’s much easier because the force is concentrated on a smaller area of the shell.

Imagine pushing an egg on to the point of a sharpened pencil. It would pierce through pretty easily, right? Now imagine pushing an egg onto a soft ball of clay. It takes much more pressure to break it. So you can imagine if the insides of a hen are pushing on the egg evenly from all directions, it gets even more difficult.