Anyway, an Open Letter to scientists: Dear Scientists, here's a little rule of thumb.

Here are some good rules of thumb

There are some simple rules of thumb

This is "The Tonight Show" Thumb Wrestling Championship Belt.

in a thumb wrestling match? [ Laughter ]

frog, this is the bow. I take my thumb and place it in the frog here, then let my hand

the bow and you lay it on the strings. Let's start again. Thumb, your hands are going to

of your thumb and your index finger together.

Thumb back here.

your thumb is going to grab the back here

Now, you do not wanna push through with your thumb,

If you push on it with your thumb, push on it like that

and the thumb is here.

I use the thumb to prevent any other card

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Well, as a rule of thumb,