Ten thousand years ago, life was different. People were nomadic, and their life spans were short. During this time, people practiced trepanning, one of the early human medical procedures. Today, the diseases that wiped out millions just a few hundred years ago have been completely eradicated thanks to developments in medicine. Readers explore some of the earliest medical discoveries, how medicine has developed, and how it continues to have an impact...

Exiled from her pack, Storm, who feels more lost than ever, searches for the two dogs that will never give up on her, Arrow and his mate Bella.

For the first time Storm can remember, she has a place in a Pack, and the world that was devastated by the Big Growl is finally at peace. But tensions are rising among the dogs of the Wild Pack--and the greatest danger they face may come from within.

There is darkness at the heart of the Wild Pack. Whisper is dead -- and Storm is certain that his wounds could only have been inflicted by another dog. Storm doesn't want to believe that one of her Packmates could have done such a vicious thing. But as she wrestles with her suspicions in the light of the Sun-Dog, at night Storm is haunted by terrifying dreams -- visions of fear and shadows that guide her paws through the forest while she sleeps. Lucky...

From a map Ziggy and his friends discover an old tunnel that was once used as a safe haven by escaped slaves. While checking out the tunnel, the trap door gets stuck and the boys are forced to use the old, dark, damp tunnels that just may be haunted. Ziggy, Rashawn, Jerome, and Rico--the Black Dinosaurs--are thrilled to discover that their hometown was a stop on the Underground Railroad, and their friend Mr. Greene has given them an old map that...

The glowing moon peeks from behind a massive stone house. The front door slowly creaks open. A feeling of gloom swells from inside the home. There's an ear-splitting shriek! What horror has overtaken this ghastly gothic mansion? In the 11 gothic mansions in this book, you will explore a mansion lit up by phantom fires, the stately site of a brutal double murder, a cliff-side castle where the ghost of a girl lingers, a house filled with human remains,...