This one is a simple idea, and it is a great way to understand what it was like for people on the Titanic. WonderWorks challenges people to hold their hand underwater for as long as they can. It's believed it was 28F (-2.2C) when the Titanic sunk, which doesn't sound so bad. But as soon as I put my hand in water, it was way too cold for me. Now imagine if you were stuck involuntarily in the water from your shoulders to the feet. That's how most perished on the Titanic. It's purely awful and tragic.