Other birds flying in the upwash experience reduced drag, and spend less energy propelling themselves.
If the Hadza's bodies somehow manage to spend less energy in those areas, they could easily accommodate the elevated energy demands of hunting and gathering.
If bird-watchers truly cared about birds, Xiaoxiaoge wrote, they would spend less energy on making pretty images and more time defending nature against human threats.
But in his recent interview, Francis made a plea for quieter, calmer weather, suggesting that church leaders in Rome spend less energy on denunciations and censorship.
We think that the Hadzas' bodies have adjusted to the higher activity levels required for hunting and gathering by spending less energy elsewhere.
He and his team spent less energy on disputing the details of evidence than on maintaining support from fellow-Democrats and from the public.
"The increased frictional drag makes the water flow more closely next to the body, so there is less water resistance and the swimmer has to spend less energy," Professor Pendergast said.
The first thing England really need to know is that the teams who take care of the ball, and spend less energy chasing to get it back, will inevitably go the furthest in these conditions.
Some analysts suggest that the deferral of payment in this way will encourage advisers – who receive a team bonus for meeting targets – to spend less energy on the difficult cases.
At other times he has hinted he would spend less energy on humanitarian missions and more on dealing with great powers like China and Russia and on shoring up America's alliances.
