IRA FLATOW, HOST:
Flora Lichtman is here with our Video Pick of the Week. And it is more coffee.
FLORA LICHTMAN, BYLINE: Our fabulous coffee series by the great Jenny Woodward continues on SCIENCE FRIDAY. Drink up, everybody. This week we're diving into a tiny glass of espresso.
FLATOW: Ooh. Ooh. So small dive.
LICHTMAN: You need to be very careful. Keep your limbs in.
FLATOW: And why - what's so fascinating about espresso?