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$Math for Kids$

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There are between 100,000,000,000 and 1,000,000,000,000 stars in a normal galaxy.
Sound travels about 4 times faster in water than in air.
In a full grown rye plant, the total length of roots may reach 380 miles (613 km).

in a full grown rye plant, the total length of fine root hairs may reach 6600 miles (10,645 km).
A large sunspot can last for about a week.
Boron nitride (BN) is the second hardest substance known to man.