Why is the Martian soil considered toxic, and how does that affect growing food on Mars?

Sadly, if Mark Watney really had to try and survive by growing potatoes in his own shit, he would still be on Mars – and very dead. What Andy Weir…

How accurate is the science in ‘The Martian’? Could a man really survive on Mars for so long as shown in the film?

I saw the movie. It was really good. A lot of the science was pretty good, but not all of it. The soil of Mars can grow food…

What would happen if we poured 1 billion liters of water on Mars?

So – let’s get this into cubic meters. A liter is 1/1000th of a cubic meter – so we’re talking about a million cubic meters – which would…