Sour Power Observing two cups of milk?one refrigerated
and one left out in a warm place?is an easy
way for students explore the effects of temperature
on the growth of bacteria. In this weeklong activity,
students will see for themselves how non-refrigerated
milk sours. You can then explain how the bacteria
produce lactic acid, which causes the milk to
Antibacterial Action In this activity, students test out the effectiveness
of different antibacterial soaps by cultivating
cultures of the germs that remain on their hands
after they?ve washed with regular soap.
The activity is a great way to introduce the concept
that antibacterial soaps, which kill good germs
along with bad, pose health risks.