Video explanation


Sentence Source
He said that in 30 years of fishing he had never seen a dolphin do that. The oil spill's unseen culprits, victims
His core temperature had dropped to 77 degrees. How I held my breath for 17 min
I had never used a computer. How I harnessed the wind
For one thing, Germany had surpassed Britain in industrial strength by 1900. Joseph Nye on global power shifts