1.3 billion: the number of pixels in this new panorama of Mars, taken by the Curiosity rover (go explore the red planet!)
-321 degrees Fahrenheit: the boiling point of liquid nitrogen, which is a terrible thing to pour in a swimming pool full of people
1890: the year wiretapping began in the U.S.
34 stories: the planned height for the world's tallest wood skyscraper, set to go up in Stockholm by 2023
40 milligrams: the weight of a backpack for dragonflies created by neuroscientists at Howard Hughes Medical Institute (no, really)
$2,000: the price of this new voice-controlled motorcycle helmet with a head-up display
4: the number of quarks in a particle that recently popped up in a Japanese collider (yep, that's right—physicists discovered the first known four-quark particle!)
11.2 billion: the number of parameters in the world's largest artificial neural network, built by Stanford University researchers (a real human brain has 100 trillion connections)