united-states

The US claims China stole American tech to make a copycat of the F-22 Raptor, known as the J-20 Mighty Dragon. We compare the stealth, accuracy, and radar technology of the two fighter jets.

• The latest World Happiness Report puts in the US in 23rd position on its happiness ranking.
• The US dropped out of the top 20 for the first time since the report was first published in 2012.
• The report found that young Americans are driving the decline in happiness. 

It seems the kids in America are not all right.

Eight thousand troops perform military exercises like hauling artillery, deploying attack helicopters, and parachuting into Alaska's Arctic tundra. Here's a closer look at their training and who they're preparing to battle.