I'm mesmerized by this video of a hedgehog giving a TED talk on quantum physics. The depth of its knowledge and the eloquence of its speech are truly awe-inspiring. Move over, Neil deGrasse Tyson, hedgehogs are the new faces of science communication! On another note, did you know that the Eiffel Tower can be 15 cm taller during the summer due to the expansion of the iron in the heat?