What's The Longest English Word?

Ok smartypants, put your hand down. It's antidisestablishmentarianism, right? Maybe not. Robert Krulwich explains.

Science writer Sam Kean, in his book The Disappearing Spoon, worked really hard on this and after much sleuthing, he landed on a word that comes not from dancing English nannies but from virus-hunting scientists. It's a protein, found in a virus, but this is a very dangerous, economically important virus, the first ever discovered.

Compare with the Wikipedia entry on long words, which contains this glorious non-word:

Twoallbeefpattiesspecialsaucelettucecheesepicklesonionsonasesameseedbun.