For three weeks, the participants lay in bed with their heads tipped down at a 6 percent tilt.
三周时间里，参与者保持头部6度向下倾斜躺在床上。
2
And we didn't know whether we were going to be looking at history or not because when you look at a curve like that, an exponential curve going up can often just tilt over and crash back down again.
我们并不知道是否会鉴证历史，因为，在您看到那样的一个曲线时，那种上升的指数曲线往往会再次倾斜下滑。
3
And so the mirror can only tilt but cannot go down.