How does a manifyign glass light up a matchstick?

A combustible material,when exposed to heat and a source of oxygen,produces fire. Holding a mangnifying glass so that the rays of light passing through the lens meet on the matchstick, concentrates on the energy of the photons in a single spot and produces greater heat then the heat we feel on our skin from the Sun. Then,flame is produced.

How does a manifying glass works?

A manifying glass works by creating a magnified virtual image of an object behind the lens.The distance between the lens and the object must be shorter than the focal length of the lens for this to occur.Otherwise,the image will appear smaller and inverted, and can be used to project images onto surfaces.

The framed lens may be mounted on a stand, keeping the lens at the right distance from the table, and therefore at the right distance from the object on the table. The latter applies if the object is small, and also if the height is adjustable. Some magnifying glass are foldable (from the handle or stand)

wikipedia.

There is definitely difference in assymetry between the sexes.This is due to the different lifestyles and different genetic compositions of individuals.As a result,morphological structures-jaws,left or right side of face- would be different.There is no perfect symmetry,just that women has better symmetry in echoism, harmonium and prima copulism in order to attract the males.

As one ages,their cells degenerate and their bodily functions deteriorate.Thus wrinkles and formed,and this would further change the structure of face.

Different groups of people would have different facial colour,facial hair length, etc. For example,sikhs are encouraged to grow longer beards while others don't.

It is almost genetically impossible for any organisms to demonstrate asymmetric facial expression. In living nature, as in the material world in general, there is no completely symmetric or completely asymmetric objects.

Animals may have neural pathways for skills with one hand (or paw) that takes less effort than doing the same with both hands. This goes with humans where we would only need one hand to write.

http://en.wikipedia.org/wiki/Facial_symmetry

http://www.alma.edu/departments/psychology/ST96COG/Facialasymmetry/Face.html

http://www.bleaching-dental.com/articles/asymmetry_of_the_face_head_and_skull_man.html

What would happen if the freezing point of water became 10 degrees C?

The colder areas would be most affected.

Firstly,organisms may die due to lack of water.People living in colder areas may die as blood freezes too.Furthermore, ships will find it difficult to cross the waters near northern and souther hemisphere.Fishermen will suffer lower fish catches as more waters freeze.As a result,humans have no food and they will die.On the other hand,there would be less floods occurring due to more water freezing to ice at places like Northern US and Canada.We would enjoy more land space due to lower ease of water freezing.Yet,this would mean that plants that thrives at temperatures below 10 degree celsius would be wiped out.In conclusion,if water freezes at 10 degrees Celsius,it would be more of a disaster.

Tough, Flexible T-shirt that could replace Body Amour.

The invention is about a simple t-shirt was developed tough enough to detect bullets.It combines carbon with boron (one of the hardest material in Earth)

It is started with plain, white T-shirts that were cut into thin strips and dipped into a boron solution. The strips were later removed from the solution and heated in an oven. The heat changes the cotton fibers into carbon fibers, which react with the boron solution and produce boron carbide.They increased the toughness of a T-shirt by combining the carbon in the shirt’s cotton with boron – the third hardest material on earth. The result is a lightweight shirt reinforced with boron carbide, the same material used to protect tanks.The result is a fabric that’s lightweight but tougher and stiffer than the original T-shirt, yet flexible enough that it can be bent. That flexibility is an improvement over the heavy boron-carbide plates used in bulletproof vests and body armor.The currently used boron-carbide bulk material is brittle and the boron-carbide nano wires they synthesized keep the same strength and stiffness of the bulk boron carbide but have super-elasticity. They are lightweight and flexible.

The fascinating aspect that blew my mind,is that an ordinary T-shirt could turn to protect those police officers.It could even be used to produce lightweight,fuel-efficient cars and aircrafts.