How long does it take sunlight to reach the Earth?
Here's a question… how long does it take sunlight to reach Earth? This sounds like a strange question, but think about it. Sunlight travels at the speed of light. Photons emitted from the surface of the Sun need to travel across the vacuum of space to ...
Is time travel possible? (How does Santa do it?)
How does Santa manage to deliver presents to the world in just one night? Could he be using time travel ... 60 nanoseconds faster than the 2.3 milliseconds it would take a photon travelling at the speed of light (299,792,458 metres per second in a vacuum ...
How does radiation travel, and what kinds of damage can it do?
The nuclear disaster in Japan has left many people in danger of exposure to radiation and radioactivity. Some are simply fearful. What exactly is this radiation? And what threat does ... a vacuum, or through air or water. They can also cut through light ...
How Many Earths Would It Take To Sustain Your Lifestyle?
“Consumer Consequences” is an online “game” where you enter data about your living, work, travel, energy, and eating patterns, then see how many earths would be needed ... mainly because of the amount of take-out food we order every month.
How Many Men Does It Take to Change 1,944 Light Bulbs?
He was looking upward like everybody else, watching workers 100 feet in the air take down the Paramount's 80-year-old ... He's come out to fix it many, many times over many, many years." Tom Bonifant began his sign career several decades ago in sign ...