Luckily the hamsters are very cozy in their boxes. They have given us a lot of wheel-running data. Let us look at the data very carefully now . Last week we learned hamsters have a special brain part that helps them tell time. Now, read about why we changed the hamsters' lights again .
Scientists like to repeat experiments.
They want to see if the second experiment turns out like the first one. We have some more hamsters living in constant darkness. We can learn two things from today's running data. Read about the hamsters in constant darkness . We have finished our set of experiments.