Weekly News Quiz for July 18-22, 2011

How closely do you follow world events? Test your news knowledge – from the obvious to the obscure – with our photo quiz.

1. US Energy Secretary Steven Chu says the heat wave has put a strain on the nation's power grid. But how hot is it really?

So hot you could fry an egg on the sidewalk in Detroit

So hot you could bake cookies in a car in South Bend, Ind.

So hot that robins were using potholders to pull worms out of the ground in Phoenix, Ariz.

So hot that farmers in Salina, Kan., fed their hens crushed ice so they'd stop laying hard-boiled eggs

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