What is Big Think?  

We are Big Idea Hunters…

We live in a time of information abundance, which far too many of us see as information overload. With the sum total of human knowledge, past and present, at our fingertips, we’re faced with a crisis of attention: which ideas should we engage with, and why? Big Think is an evolving roadmap to the best thinking on the planet — the ideas that can help you think flexibly and act decisively in a multivariate world.

A word about Big Ideas and Themes — The architecture of Big Think

Big ideas are lenses for envisioning the future. Every article and video on bigthink.com and on our learning platforms is based on an emerging “big idea” that is significant, widely relevant, and actionable. We’re sifting the noise for the questions and insights that have the power to change all of our lives, for decades to come. For example, reverse-engineering is a big idea in that the concept is increasingly useful across multiple disciplines, from education to nanotechnology.

Themes are the seven broad umbrellas under which we organize the hundreds of big ideas that populate Big Think. They include New World Order, Earth and Beyond, 21st Century Living, Going Mental, Extreme Biology, Power and Influence, and Inventing the Future.

Big Think Features:

12,000+ Expert Videos

1

Browse videos featuring experts across a wide range of disciplines, from personal health to business leadership to neuroscience.

Watch videos

World Renowned Bloggers

2

Big Think’s contributors offer expert analysis of the big ideas behind the news.

Go to blogs

Big Think Edge

3

Big Think’s Edge learning platform for career mentorship and professional development provides engaging and actionable courses delivered by the people who are shaping our future.

Find out more
Close
With rendition switcher

Transcript

Big Think: How have today’s super-accurate clocks changed the way we understand time?

Michio Kaku: Believe it or not, a clock on your head beats at a different rate than a clock on your foot. We can now measure this and it has practical importance as well. First of all, Einstein said that time is a river. It's a gigantic river were all swept up in the river of time and it can speed up and it slows down. For example, on the moon; did you know, that time beats faster on the moon than it does on the earth and we can measure this? On Jupiter, time beats slower on Jupiter that it does on the Earth. So time beats at different rates. When an object moves very fast, time slows down inside that rocket that is moving very fast. If that rocket is then placed on the Moon, time beats faster. So we have to do competing effects. This has a direct implication with regards to your cell phone.

Your cell phone has GPS which allows you to locate objects on planet Earth by focusing in on satellites orbiting the planet Earth. Satellites travel at 18,000 mph if they’re in lower earth orbit; therefore time slows down for those low-lying satellites. But if satellites go farther and farther away, gravity gets less and less and less so time speeds up. So in outer space we have two competing effects. Fast satellite slowdown in time, very faraway satellites speed up inside and in fact, at one radius you could calculate time beats exactly at the same rate as it does on the planet earth. So what does it mean? Your GPS system would totally fail without Einstein's theory of special and general relativity.

This also means that the top of your head because it is farther from the center of the earth, beats at a faster rate... time beats at a faster rate then your feet. So you can actually show that even within your own body now—our instruments are so accurate—that you could show within your own body the fact that time beats at different rates within your own body.

Directed / Produced by
Jonathan Fowler & Elizabeth Rodd

More from the Big Idea for Wednesday, April 20 2011

 

Why Your Head Is Older Than...

Newsletter: Share: