Dead Man’s Switch is a really cool service. It makes sure you are alive, by sending you an email and you have to click on the link to verify you are alive. If not, then whatever you have emailed them, will be sent out as per your instructions.
Ever wondered what the oceans of our world have in their depths? This is a great infographic that explains it. Albeit slightly dated (since it does not include James Cameron’s decent to the Mariana Trench in 2012.