Li explained the law of conserving energy with just one coin
energy is a wonderful thing, exists around our lives, from energy that sustains life for people to energy to generate electricity ... but to answer what energy is, not everyone
Tags : rhett allain
Professor My explains the technique of climbing walls with bamboo pole of Vietnamese task force
using only a long bamboo stick, the vietnamese task force can climb the wall quickly in a direction perpendicular to the wall, which seems impossible.