No! The Earth Would NOT Look Like This Without Water

No, no no, and again: no! The Earth would NOT look like this without water. Please stop sharing this nonsense. Here some numbers: the Earth has a diameter of about 12,735 kilometers (on average). The highest point on Earth is the top of Mount Everest, at 8,848 meters (29,029 feet). The deepest point on Earth […]

A bowling ball and feather falling in a vacuum – do they fall at the exact same speed?

A beautiful video published by BBC: the English physicist Brian Cox tests how a heavy object (a bowling ball) and a lightweight object (feather) falling in a vacuum – if they fall at the exact same speed or not.