problem

How long does it take to fall through the center of the Earth to the other half vertically?
Suppose you dig a long tunnel to the center of the Earth, jump in it and let gravity pull you down. How long will it take you to reach the other side of the globe?
You are inferior to children if you cannot solve this puzzle under 20s
Today, we come to a puzzle that is storming the world's forums these days: classic puzzle puzzle.
Are you among the 20%
This problem is relatively harmful to the brain, but it is extremely easy to think of!
Straight line is not the fastest way?
We all know that to go from position A to position B, the straight line is the optimal choice. But the following Math problem will make you look completely different!
The international press has a headache with Vietnam's super-difficult grade 3 problem
Recently, the famous magazine The Guardian published a math lesson for an 8-year-old Vietnamese student to challenge readers.
Trying with the problem of 263 years, there is no right answer
Can you overcome obstacles to challenge humanity's most transcendent wisdoms for nearly three centuries?