We just learned about ethylene, and we've learned a lot about where we get oil and what we use it for.
Let's learn a little about flags!
Sometimes boats will hang up special flags to send a message to other boats.
These are called International maritime signal flags.
There is a flag for each letter of the alphabet A-Z and each of the numbers 0-9.
Sailors can use them to spell out messages, but also each flag has a special meaning too.
Ships use these flags to tell other people they are in trouble and need help, to warn people of danger, or even during sailing races to give messages to the boats sailing.
(from: wikipedia - international maritime signal flags)
Kid Facts - Blast from the past: Computer Monitor
