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Fox Photos/Getty Images
Fox Photos/Getty Images

How to Make Sure Your Eclipse Glasses Are Safe

Fox Photos/Getty Images
Fox Photos/Getty Images

You’re probably already preparing for the August 21 solar eclipse, right? It’s going to be spectacular, especially for those in the path of totality, which stretches across the U.S. from South Carolina to Oregon. No matter where you live, though, if you want to watch the eclipse, you should get ahold of some eclipse glasses. To make sure your glasses are up to safety standards, your specs need to follow a few guidelines from NASA before you look up.

First, you should be able to see the manufacturer’s name and address somewhere on the glasses. There are five brands of eclipse glasses that the American Astronomical Society has verified as meeting eclipse safety standards:

  • American Paper Optics
  • Baader Planetarium (only the AstroSolar Silver/Gold film)
  • Rainbow Symphony
  • Thousand Oaks Optical
  • TSE 17

You should also verify that the glasses list the correct certification information, confirming that they’re safe to use when looking directly at the sun. Somewhere on the glasses it should say that the glasses meet the ISO 12312-2 transmission requirements, and you’ll see an ISO logo from the International Organization for Standardization.

This is what your glasses should look like, according to NASA’s guidelines [PDF]:

An illustration of paper eclipse glasses with the necessary safety standards information circled in red
NASA [PDF]

Even if your glasses have all the right information written on them, make sure to take a second look. Be careful not to use lenses that are wrinkled or those that have scratches on them. They should also be relatively new—don’t use any that are more than three years old.

We previously wrote about Warby Parker's free eclipse glasses, which you can pick up in the company's stores in August. We've reached out to the company about whether their glasses meet these guidelines and will update the story when we hear back.

Read the rest of NASA's eclipse safety recommendations here.

Update: Warby Parker has confirmed that their free eclipse glasses are made by American Paper Optics, a certified brand. View away!

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Space
The Fascinating Device Astronauts Use to Weigh Themselves in Space

Most every scale on Earth, from the kind bakers use to measure ingredients to those doctors use to weigh patients, depends on gravity to function. Weight, after all, is just the mass of an object times the acceleration of gravity that’s pushing it toward Earth. That means astronauts have to use unconventional tools when recording changes to their bodies in space, as SciShow explains in the video below.

While weight as we know it technically doesn’t exist in zero-gravity conditions, mass does. Living in space can have drastic effects on a person’s body, and measuring mass is one way to keep track of these changes.

In place of a scale, NASA astronauts use something called a Space Linear Acceleration Mass Measurement Device (SLAMMD) to “weigh” themselves. Once they mount the pogo stick-like contraption it moves them a meter using a built-in spring. Heavier passengers take longer to drag, while a SLAMMD with no passenger at all takes the least time to move. Using the amount of time it takes to cover a meter, the machine can calculate the mass of the person riding it.

Measuring weight isn’t the only everyday activity that’s complicated in space. Astronauts have been forced to develop clever ways to brush their teeth, clip their nails, and even sleep without gravity.

[h/t SciShow]

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Watch Astronauts Assemble Pizza in Space
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iStock

Most everyone enjoys a good pizza party: Even astronauts living aboard the International Space Station.

As this video from NASA shows, assembling pizza in zero gravity is not only possible, it also has delicious results. The inspiration for the pizza feast came from Paolo Nespoli, an Italian astronaut who was craving one of his home country’s national dishes while working on the ISS. NASA’s program manager for the space station, Kirk Shireman, sympathized with his colleague and ordered pizzas to be delivered to the station.

NASA took a little longer responding to the request than your typical corner pizzeria might. The pizzas were delivered via the Orbital ATK capsule, and once they arrived, the ingredients had to be assembled by hand. The components didn’t differ too much from regular pizzas on Earth: Flatbread, tomato sauce, and cheese served as the base, and pepperoni, pesto, olives, and anchovy paste made up the toppings. Before heating them up, the astronauts had some fun with their creations, twirling them around like "flying saucers of the edible kind,” according to astronaut Randy Bresnik.

In case the pizza party wasn’t already a success, it also coincided with movie night on the International Space Station.

[h/t KHQ Q6]

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