What's the answer
Waterways are useful because people use them to transport things, and to travel.*I hope this is what you were looking for. Otherwise, sorry.
There are many things that interest a person about a product. These things might include certain features or useful functions.
I think it was probably to become a better person so she invented useful things like the radioactivity and the x-rays so she probably just wanted to be a better person and liked to help people
There are many different things that people can be referring to when talking about a boost. A boost, whether it be in physical form or as in a paycheck, can be useful because it helps accelerate the process of things.
Wood burns easily, creating fire; fire creates heat. The heat is used to cook food and warm people, especially in cold temperatures. The heat is also used to burn things, such as paper plates when camping.
To carry things around for people or to carry people around. (:
people are not useless. they are good at many things and useful too, they just don't notice it most of the time. for example if you hold a door for someone you are being useful. just breathing in this world makes a person useful you don't even have to do anything. your parents find strength to get up and live because you are there. that also makes you useful. remember you are only one person in this world but you may mean the world to someone else. you may just not know it and it doesn't have to be your parents. so no people aren't as useless as you because you aren't useless either. just remember that.
The answer I think is Natural Resources
A map is a useful tool for that purpose.
a personal organiser is most useful for people who need to keep ontop of a lot of things and information, things such are business dates or trip, phone numbers and addresses.
It creates a representation of something difficult to see.