Physics
A nuclear reactor is said to have become 'critical' when

It is ready to produce controlled energy
It is shut down to avoid explosion
It starts emitting dangerous radioactive radiations
It stops due to malfunctioning

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the microwaves to get into the food through the holes
To allow the heat to get into the food through the hole
To prevent the steam pressure from bursting open the pouch
To allow the aroma of the food to come out through the holes

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