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Night. Unless the sun is so bright during the day, that is is blinding you, therefore you cannot see.
(see question Which is harder to compress solid liquid or gas)
Bang it on the ground then listen to see if the sound comes back
The hardest substance in a rock would be the hardest mineral of which the rock is composed.
Hardness - Hardness may be defined as a material's resistance to scratching. The diamond is the hardest gemstone and the hardest substance known in nature. Nothing can scratch a diamond except another diamond. However, diamonds and many other "hard" gemstones can chip.(Please see the Related Link below.)
The Hardest Part Is the Night was created on 1985-08-21.
Night. Unless the sun is so bright during the day, that is is blinding you, therefore you cannot see.
Being able to see in the dark - No, that one's easy: Night sight!
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Most states allow holders of learner's permits to drive at night because it is necessary to the learning experience. Holders of occupational and other driving permits should check their restrictions to see if driving at night is permitted.
Within the distance you can see ahead
because you can't see them at night and plus when you are driving you don't want to hit them.
Driving too fast for conditions Driving after drinking Driving at night
Wear sunglasses. You will still be able to see the road.
Improbable chaos
the osteocytes are the hardest part to see because they are so small