rule of thumb. Okay. Let's take a look at the note here. A rule of thumb is a guide

or principle often based on experience. Or you know, those people that have

experience and they say you know, you should do this or you should follow this

rule. So let's continue here. The origin and phrase is unclear. Yeah. I've read

that there's a few different ideas about where it might have come from, but this

is a ... we'll just mention one here. Some think it may refer to the idea that

an inch came from the measurement from the joint to the tip of the thumb. Yeah.

If you're looking at your finger like from here to here. It looks like about an

inch. It does look similar to it. So I don't know if that's where it came from

or not , but that's what some people think. All right. Let's look at the couple of

examples here. Number one. If you go overseas , as a rule of thumb don't carry

cash.. That's what they usually tell you or don't carry all cash. Most still

advise traveler's checks. You know, some people I don't know, maybe they use a

credit card but that could be dangerous too. In case that gets stolen, than

you can lose more money. All right. Let's look at number two here. If you are going

to climb very high mountains, like Mount Everest or some comparable sort of a

high mountain. As a rule of thumb you should carry an oxygen bottle with you

just in case you experience either some altitude sickness or have trouble

breathing. When you're up at the top of the mountain there. Yeah. You , you don't

want to end up and turn it into some sort of an emergency situation where

where it could be fatal, a fatal trip. Anyway, I hope you got it. I

hope it's clear. Thank you for your time. Bye-bye.