1. Paper can only be folded seven times
It is commonly accepted that you cannot fold a single sheet of paper in half more than seven times, no matter what paper finish, size, or basis weight you are using, for two main reasons: Every time you fold your sheet, you reduce your total surface area by half, so eventually you run out of the surface area to fold.
2. Diamond is the hardest substance on earth
Diamond is composed of pure carbon, and the atomic bonding of atoms makes it the most complex material. Powerful bonding makes diamond most challenging among all other substances, but there is one direction where the bonds are not as strong, and a diamond can be cleaved along this direction with impact.
3. There are only five senses
Humans have five basic senses: touch, sight, hearing, smell, and taste. The sensing organs associated with each sense send information to the brain to help us understand and perceive the world around us.
1. Touch
Touch is thought to be the first sense that humans develop. Communication consists of several distinct sensations communicated to the brain through specialized neurons in the skin.
2. Sight
Sight, or perceiving things through the eyes, is a complex process. First, light reflects off an object. The transparent outer layer of the eye called the cornea bends the light that passes through the hole of the pupil. The iris works like a camera's shutter, retracting to shut out light or opening wider to let in more light.
3. Hearing
This sense works via the complex labyrinth that is the human ear. Sound is funneled through the external auditory canal. Then, sound waves reach the tympanic membrane or eardrum. This is a thin sheet of connective tissue that vibrates when sound waves strike it. The vibrations travel to the middle ear. There, the auditory ossicles, malleus, incus, and stapes vibrate. The stapes bone, in turn, pushes a structure called an oval window in and out, sending vibrations to the organ of the Corti. This spiral organ is the receptor organ for hearing. Tiny hair cells in the organ of Corti translate the vibrations into electrical impulses. The impulses then travel to brian via sensory nerves.
4. Smell
Humans may be able to smell over 1 trillion scents, according to researchers. They do this with the olfactory clefts, which are found on the roof of the nasal cavity, next to the "smelling" part of the brain, the olfactory fissure, and the fossa. Nerve endings in the olfactory cleft transmit smells to the brain.
5. Taste
The gustatory sense is usually broken down into the perception of four different tastes: salty, sweet, sour, and bitter.
4. Discovery of water in Mars
In 2018, scientists reported discovering a subglacial lake on Mars, 1.5 km (0.93 mi) below the southern polar ice cap, with a horizontal extent of about 20 km, the first known stable body of liquid water on the planet.
5. Discovery of the Southern Ocean
Starting on June 8, World Oceans Day, it will recognize the Southern Ocean as its fifth ocean. 
6. Grenade survival
Grenades and explosives are no joke, and if we encounter one in person, we think we are generally doomed. If you encounter a grenade underwater, You are less likely to survive than if you discover a grenade by land.
7. Onions make us cry
When we slice onion, the onion cells release sulfur into the air. Sulfur reacts with eyes and forms a small amount of sulphuric acid. Sulphuric acid leads to burning and tears.
8. Cyanide causes instant death
It breaks the electron transport system in the human body.
9. Milk tastes sweet, but curd taste sour
Milk has a sugar named Lactose which makes the milk sweet. But when it is converted into curd, Lactobacillus converts Lactose to lactic acid because the acid curd tastes sour.
10. Oxygen has a color
As a gas, oxygen is odorless and colorless. In its liquid and solid forms, however, it looks pale blue.
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