Wednesday, November 5, 2014
Time travel's been one of man's wildest fantasies for centuries. It's long been a popular trend in movies and fiction, inspiring everything from Charles Dickens' A Christmas Carol to H.G. Wells' The Time Machine to the Charlton Heston shrine that is The Planet of the Apes. And with the opening of Interstellar today—n0t to spoil anything—we're about to fantasize about it even more.
The most fantastic thing? It's probably possible.
What's almost impossible
Let's start with the bad news. We probably can't travel back in time and watch the Egyptians build the pyramids. In the last century scientists came up with a number theories that suggested it is indeed plausible to take a leap into the future; going back in time, unfortunately, is much more complicated. But it's not necessarily impossible.
Albert Einstein laid the groundwork for much of the theoretical science that governs most time travel research today. Of course, scientists like Galileo and Poincaré that came before him helped, but Einstein's theories of special and general relativity dramatically changed our understanding of time and space. And it's because of these well-tested theories that we believe time travel is possible.
One option for would be a wormhole, also known as an Einstein-Rosen bridge. Along with physicist Nathan Rosen, Einstein developed suggested the existence of wormholes in 1935, and although we've yet to discover one, many scientists have contributed their own theories about how wormholes might work. Stephen Hawking and Kip Thorne are probably the most well known. Thorne, a theoretical physicist at CalTech, even helped Christopher Nolan with the science behind Interstellar.
What's almost certainly possible
In recent years, we've seen some aspects of Einstein's fanciful theories proven true. The latest and perhaps most exciting theory is the aforementioned effect called time dilation. Though we've based technology on the theory for decades, an experiment finally proved this year that time dilation is absolutely a real phenomenon. It's also a phenomenon that could allow us to travel into the future.
Time dilation basically refers to the idea that time passes more slowly for a moving clock than it does for a stationary clock. The force of gravity also affects the difference in elapsed time. The greater the gravity and the greater the velocity, the greater the difference in time. Black holes,like the one depicted in Interstellar, for instance,would produce a massive amount of time dilation, due to their extreme gravitational pull.
Thanks to the space program, we've actually been dealing with this effect for many years. This is why the clocks on the International Space Station tick just a little bit more slowly than clocks on Earth do. Since the space station is moving so fast and is affected by less gravity, time moves more quickly. It's also why no clock on Earth is perfectly accurate, since the effect of time dilation means that time moves more slowly closer to the planet's surface. Okay, maybe one close is almost perfect.
A better example of time dilation at work involves GPS satellites. The GPS chip in your smartphone works because there are 24 satellites circling the globe at all times that triangulate your location based on how long it takes time-stamped information to travel to and from the device.
However, scientists learned when building the system that the atomic clocks on GPS satellites do indeed run a little bit fast, since they're moving 9,000 miles per hour in orbit. To be specific, they lose 8 microseconds a day. That's hardly perceivable, but it's enough to throw off the location data. And so GPS technology makes adjustments to the clocks on board to account for the relativistic effects. The equation used is kind of complicated.
The implications of all this are huge. What if you took this to the extreme? If you jumped in a spaceship that flew super fast, time would pass more quickly for people on Earth. You could do a lap around the galaxy and return to Earth in the future. This is basically what happens inPlanet of the Apes. In effect, Charlton Heston's character is a time traveler.
What's definitely possible (but kind of silly)
The question remains, can we really take it to that extreme? And is it possible to go backwards through time, too?
Once again, we don't really know. Einstein's theories tend to rule out rewinding time, but they're still theories. It's possible some future discovery could prove them wrong. As for the wormhole approach, we won't really know exactly how that works until we try it, and at the moment, we don't really have a feasible method for building a wormhole in space.
Hence, one easy way to find out is simply to search for time travelers walking amongst us. No laboratory required! And that's exactly what several zany scientists have done. (Spoiler: They haven't found any.)
If you're really curious about time travel though, go see Interstellar. The science behind it is sound—if sometimes a bit fantastic—but the movie itself is very fantastic.
Saturday, November 1, 2014
Belting out your favorite track in the shower is definitely a highlight of the morning. No, it’s not necessarily all that tuneful…but that’s only because there’s no backing track, of course. The fix for that is something like the Bluetooth Shower Speaker from TRNDLabs, which is fully water-resistant, and is currently on sale at a 60% discount.
The funky-looking Shower Speaker comes with a suction-cup mount so it can cling on to wet walls, and it can wirelessly hook up to any music-giving device within 10 meters. But just as impressively, it has an in-built microphone, which allows for hands-free calling and Siri commands while you’re scrubbing up. The internal rechargeable battery can keep going for around 5-6 hours, and there’s a basic array of music controls on that plastic fascia.
GET SHOWERED WITH MUSIC
This takes singing in the shower to the next level. Get your tunes blasting and make your shower time an even better part of your day. The speaker is water-resistant and features a handy suction cup that allows you to secure it to the shower wall.
Its user-friendly design lets you control it with ease with play/pause and forward and rewind buttons in back. The speaker comes with everything you need to enjoy it right away and it features a built-in rechargeable battery so you don’t have to worry about running for new batteries.
WHY YOU’LL LOVE IT
Who doesn’t love jammin’ out in the shower? We do and with this affordable, quality speaker does exactly what we need. It easily syncs up with our phone, tablet, or PC and can be played up to 10 meters away from your device.
Use it in the shower or even at the pool. For your added convenience this super sleek gadget is Siri compatible so you can make hands-free calls from anywhere.
Connects to your smartphone or device with Bluetooth connectivity
Wireless connection range of 10 meter
Showerproof casing with IPx4 rating
Works in a range of up to ten meters
Can also be used at the beach or pool parties as water resistant speakers
Powered by in-built rechargeable battery – cable included
Suction cup attachment will grip to most flat surfaces
Built in Microphone
Buttons for music and call control
Siri compatibility so you can make hands-free calls from the shower with a compatible phone
WHAT YOU’LL NEED
Works with any bluetooth-enabled audio device
Size: 85×85×80 mm
Audio Power Output: 3W
Thursday, October 9, 2014
A piece of paper is inserted to the left
As it moves to the right, it folds and becomes a paper airplane
A school teacher’s nightmare
Watch the paper airplane master at work
Aside from this badass paper airplane machine gun, check out this guy’s YouTube channel, where he publishes instructional videos on how to create various paper airplanes.
source : Gizmodo