Award-winning author-illustrator Don Brown explores the science of time in It's About Time!, part of the Big Ideas That Changed the World graphic novel series

In It's About Time!, narrator Albert Einstein takes kids through time-literally. Measuring time is explored, from the stone circles and giant pyramids of ancient cultures to hourglasses and sundials to early time pieces and watches to atomic clocks. The book explains why there are 12 months a year, 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute. And seven days in the week.

From Stonehenge to Greenwich Mean Time to James Hutton's Deep Time, the book helps kids understand the passage of time, and why sometimes it seems so slow and other times way, way too fast.

Also includes: Time Timeline, Who was Albert Einstein?, endnotes, and a bibliography.

Big Ideas That Changed the World is a graphic novel series that celebrates the hard-won succession of ideas that ultimately changed the world. Humor, drama, and art unite to tell the story of events, discoveries, and ingenuity over time that led humans to come up with a big idea and then make it come true.

Big Ideas That Changed the World series: Rocket to the Moon! (#1) Machines That Think! (#2) A Shot in the Arm! (#3) We the People! (#4) All Charged Up! (#5) It's About Time! (#6)