So What is the Speed of Dark? - Nerdy T-Shirt
Light: it's pretty darn fast, did you know it travels at 671 million MPH (1,079 KPH), and it covers a whole foot (30.48cm) every single nanosecond?! The real question though is, what's the speed of dark?
This t-shirt is available in a variety of Colours and Sizes sizes. The t-shirt is 100% cotton for a smooth, premium texture and is preshrunk and double stitched for extra durability. Postage is free within the UK.