What's the first indicator a scientist tried to build their own experiment using the soldering station ?

The smell of burnt fingers.

What's the scientist waiting for sitting in front of their own experiment ?

Waiting for the infinite loop they coded to finish after they claimed they didn't need the engineer's help to write the code in their experiment.

How many scientists do you need to change a light bulb ?

Theoretically just one, but it can take several until one of them can call an engineer and admit they only know how to change light bulbs theoretically.

What does a scientist call an electrolytic capacitor ?

Acid distribution subsystem.