Someone inform NASA

Science according to 7-year-old boys:

"Did you know that, um, octopusses, um, if you bite one of their tails...."

"Tentacles?"

"Yeah, tentacles, if you bite one off, it grows back, like, right away."

"Right away?"

"Yeah, like, in five seconds." (this time is quoted with authority)

"Really? What if a shark bit them ALL off at once?"

"That would take, um..."

(long pause)

"...NINE seconds."