The Week In Numbers: A 3-D Printed Invisibility Cloak, Skyscrapers That Attack, And More

£946: the money the developers of a curved glass building in London paid to Martin Lindsay after reflected light from the skyscraper melted his Jaguar XJ

18 to 27 degrees Fahrenheit: the average increase in surface temperature when moving from a rural area to a city

Hot Hot Heat Island

244 meters: the height of the unoccupied space in the world’s tallest building, the 828-meter Burj Khalifa (turns out many of our tallest skyscrapers are hiding lots of vanity height)

3 to 8 hours: the time it takes to 3-D print your own invisibility cloak

3-D printer invisibility cloak

118: the number of Large Hadron Colliders you’d need in order to test what would happen if every element on the periodic table came into contact simultaneously

Periodic Table of Elements

$65: the price of a simple kit to build your own cockroach-like robot that runs 5 feet a second and can survive 90-foot falls

Beta Dash

30: the number of pictures per second this new laser technique creates to show surgeons exactly where tumors end and brains begin

Visible Brain Tumor

7 years: the time it took 20 researchers to finally figure out the chemical composition of human urine

$79: the pre-order price of a wristband that uses your distinct heartbeat to unlock your devices

Rendering of How the Nymi Will Look When Shipped

1.63 inches: the size of the LCD screen on Samsung’s new Galaxy Gear smartwatch

Samsung Galaxy Gear

6.6 pounds: the max weight these new package-delivery drones in China can carry

SF Express Drone

$180: the price of the Adidas Springblade running shoes, which contain plastic springs to help runners go faster

Adidas Springblade

69 percent: the portion of American high-school graduates that failed to meet college-readiness benchmarks in science in 2012 (here’s how to fix U.S. science education)