Sad pipet noises

Basically it took many years before someone developed something that could be run with a trigger or button. Before that you used a vacuum (your mouth) to pull liquid into a pipette. Heard an older chemistry professor talk about a colleague who years before swallowed a salmonella sample by accident. A lot of people surely got hurt this way.

not a scientist but I’m guessing they are siphoning some chemical by sucking up a small amount in the tube to transfer it to another container