I wonder why zippers have teeth and other questions about inventions

I wonder why planes have wings : and other questions about transportation

I wonder why soap makes bubbles and other questions about science

I wonder why spiders spin webs : and other questions about creepy-crawlies

I wonder why pyramids were built : and other questions about ancient Egypt

I wonder why snakes shed their skin and other questions about reptiles

I wonder why volcanoes blow their tops and other questions about natural disasters

I wonder why penguins can't fly and other questions about polar lands

I wonder why the dinosaurs died out : and other questions about extinct and endangered animals