Because no scientific work is considered a "discovery" until it has been independently verified by several other scientists in different places. If their work verifies the original claim, then it is indeed, a "discovery" by the first scientist in question. If the work of the other scientists cannot verify it, or vary wildly from the first scientist's work, then it is not a new "discovery".
ERROR
redo
Experimental error.
You need to be more specific than that.
error
A scientist has one of the most important jobs of all, figuring out why were here, they need to take this job with great seriousness.
Error
It's called an error.
Scientist need skills like:The ability to know what they are doing.The ability to research more on what they are doing/ to find out more.KnowledgePatiencePositive effect to Failure
yes you need to make a hypothesis first.
Sight, hearing, touch, taste, and smell.
they can discover stuff to make stuff that you may use or need in the future