In this week’s Valentine’s Day card, we present to you the tardigrade. This tiny creature – the largest among them maxing out at around 1.5 mm –  is able to survive in the vacuum of outer space, and can withstand thousands of times more radiation than other animals. It can also survive at temperatures above 300 degrees Fahrenheit, and -458 F. Even if there’s no water around, the tardigrade lives on. It simply dehydrates itself to 3 percent of its normal water content in a process known as desiccation, and springs back to life once it encounters water. 

This is all to say that, if someone’s love for you is as intense as the tardigrade, that’s quite a compliment. Stay tuned for more Valentine’s Day cards for science lovers, and see previous cards here