I went to bed way too late last night with a headache, and woke up this morning with a headache. Meanwhile, my todo list keeps banging me in the head, further aggravating said headache. I'm going back to bed for a while, and hopefully wake up refreshed and ready to attack that todo list with a tensor-sponge machete. So no blog this morning, alas - call it a sick day, my first in a while. Meanwhile, here's the best table tennis rally ever (22 sec).