If you didn't know already, the show takes a look at common legends and myths and rigs up experiments to see whether they hold true.
^ Yeah last I saw of that show, they ran out of myths and just digging up weird concepts their fans think up.
But I never liked the show personally, mostly due to how they approach their "Tests" which are usually some heavily scaled down simulation which they toss a bunch of numbers at and magically claim that their scaled down test would produce such and such results, while not factoring a number of variables along the way because they either didn't do a realistic test of the real thing or they used some off-shot test that focuses on something close to what they're looking for, but not exactly.
Then they base their final conclusions on their screwed up and limited tests and state if a myth is a myth or a fact as if they're the be-all, end-all say on the matter and nobody can do any better then themselves.
How about the whirlpool test to see if one could haul down a ship?
They used a big tank full of water and produced a mini whirlpool which they threw a plastic toy boat in to see if it would sink. To their surprise it didn't....... yet for some reason they seemed to not account for the fact that even though you scaled down the experiment to the power of a whirlpool equivalent to the size of the plastic boat, they can not scale down the water they're using on the particle level, let alone the surrounding oxygen to give the same outcome of buoyancy that a full 1:1 sized whirlpool would have on a full 1:1 sized tanker or large boat...... in other words, their test was a complete waste of time.
Though they did start to catch on when buddy took the very light plastic boat out and jumped in himself and started to get pulled under. His weight and mass based on the real 1:1 water and oxygen being used with the power being used to create the whirlpool showed that a small whirlpool could easily tire out and eventually haul a human down under the surface, which would conclude that a much larger, much more powerful whirlpool could do the same thing to a full size, much larger and much heavier boat.
^ They claim it's busted..... I claim they're idiots.
But besides all that, it is a nice gesture from Obama to appear on the show..... if it helps promote science (or whatever "Science" they claim to do on that show) and get people interested in science..... who am I to argue?