Idiom of the Day
speak of the devil (and he appears)
to appear just when someone is talking about you
"Speak of the devil and he appears," I said as our colleague who we were talking about walked in the door.
Precautions while using Centrifuge
Protective inner safety lid
For centrifuges with swinging bucket rotors, fasten a protective inner safety lid (if available for your model centrifuge) onto the bucket; for those with fixed angle rotors, fasten an inner safety lid to the rotor before centrifugation. Ensure that the safety lid is properly sealed and positively locked into place.