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This is Scientific American's 60-second science. I'm Christopher in Taguata.

Perhaps you've seen the famous TED talk about so-called power poses.

It encourage viewers to change the course of their lives by assuming what are thought of as dominant postures.

So you make yourself big, you stretch out, you take up space, you're basically opening up. It's about opening up.

That's Harvard researcher Amy Cuddy. Her talk is the second most watched on the TED site,

37 million views. The 2010 study by Cuddy and colleagues that inspired the talk stated that

striking power poses can affect your hormone levels, and in turn,

your appetite for risk.

Fake it till you make it, she said.

Strike a pose and...

It could significantly change the way your life unfolds.

Problem is that memorable advice looks suspect, because several studies, with many more

participants, have tried to replicate

the original results and failed.

The most recent attempt involved 247 male college students.

That's nearly six times more volunteers than were in the original study.

And the new study found that holding poses, dominant or otherwise, had no significant effect

...