These are the Flatirons, an incredible rock formation near Boulder, Colorado. Don’t quite see what you’re looking at? Tilt your head 90 degrees to the left…

More information on the Wikipedia page.

Thanks to Geoff.

The last battleships ever built by the United States are known as “Iowa class” and were named after the states of Missouri, Wisconsin, New Jersey and Iowa. The four ships were built in the 1940s and between them have served in almost every major U.S. battle between then and the 1990s when they were decommissioned. There’s loads more detail about the ships on the Wikipedia page.

The USS Wisconsin is currently berthed in Norfolk, VA. It is in an Inactive Reserve status, meaning that it is still a commissioned warship of the U.S. Navy, but not in active service.

The USS New Jersey is now a museum at Camden, New Jersey.

The USS Missouri is berthed in Pearl Harbour, Hawaii.

The USS Iowa is part of the previously posted Suisun Bay reserve fleet in California (it’s the big one on the end). The Iowa is the only ship of the four which is currently not open to the public but has recently been acquired by Stockton, California where it will be a museum.

Thanks: Robert Amos for compiling links to all four ships and many other people for submitting at least one of the ships.

This orange crescent shaped blur is ground zero of the Tunguska Event. Way out in the Tunguska region of Russia it is where the Tunguska meteor impact is said to have taken place on the morning of June 30th 1908. The size of the blast was estimated to be 10-15 megatons. It felled an estimated 60 million trees over 2,150 square kilometers, that’s a lot of trees. Of course, there are various other tin-foil-hat theories out there as to the cause of the explosion. Some of my favourites are:

• A black hole
• An anti-matter explosion (like in star trek)
• A UFO crash
• The result of an experiment by Nikola Tesla, on the other side of the world in New York.

Thanks: Matt, morinox, Tesla_HV, Timo V Tikansalo & Rob