a person who is dangerously or foolishly creative or obsessed with experiments
una persona que es peligrosamente o tontamente creativa o obsesionada con los experimentos (una persona que es peligrosamente o tontamente creativa o obsesionada con los experimentos)
"He looks like a mad scientist when he’s working in his lab all night."
"él parece un mad scientist cuando trabaja en su laboratorio toda la noche." (él parece un **mad scientist** cuando trabaja en su laboratorio toda la noche.)
talking too much can cause trouble
to be firm and tough in negotiation
an event or experience that helps one to progress
to secure something so it cannot change
a change in leadership or authority
to catch someone off guard; to surprise unexpectedly