In the day and age when children's toys involve the use of sophisticated technology, it can be easy to forget the basics of science. It is important to make basic principles of science fun for children, so that they can be understood.
Almost always, visual aids and practical tools can be very useful in making science interesting for children. Hands on learning tends to be more deep rooted and ingrained rather than rote learning, or learning merely with words.
While teaching about something, it can be very useful to demonstrate. For example, if the teacher wants to talk about how glow sticks work, it is rather pointless to go on about it without having an actual glow stick at hand.
The most delightful thing about science is that one does not need a special place or any special objects, as the basic principles of science are all around us. And the laboratory of science is in fact, the world we live in.
Science is everywhere we look, and everywhere we look is, essentially, science. Curiosity is a virtue when it comes to learning about science. While teaching about science, if the teacher instils a streak of curiosity about the world in the child, then the teacher has been hugely successful.