Micro hydro power is clean, renewable energy. Here is a micro hydro
generator which can supply stably output voltage and output current with
the help of one voltage stabilizing circuit and one rechargeable
battery. We can install it at home to save household energy, like using
spray shower to light LEDs etc.
One of the neat things about their method is that the robot is not
stationary while opening the door or drawer. "While pulling on the
handle," they write in their paper, "the robot haptically infers the
mechanism's kinematics in order to adapt the motion of its base and
In other words, most researchers trying to make robots open doors,
cabinets, and similar things rely on a simple approach: keep the robot's
base in place and move its arms to perform the task. It's easier to do
-- and in fact that's how most robot manipulation but limits the kinds
of tasks a robot could accomplish.