Sid brings home an estimation jar from school, filled to the top with seashells. He’s determined to guess how many there are, but he has a problem…there are too many shells to count! At school, Sid and his friends learn a new strategy for making their best guess -- estimation! Now Sid can estimate just about anything -- shells, toys, leaves and stars in the sky!

Sid is troubled…he wants to know how to measure a giant blue whale with his ruler. At school he learns a great new way to measure just about anything -- using the method of non-standard measurement! Sid learns how to accurately measure things with shoes, blocks, and even people!

Sid has quite a collection of science tools in his room: a ruler, an estimation jar, a chart and a magnifying glass. They’re all perfect tools for investigating and exploring the world, but Sid can’t figure out which one is his favorite! His friends help him discover that each science tool is amazing in its own special way.

Sid wants to know why his beloved yellow banana has turned brown and mushy. After exploring how fruits and vegetables slowly change, Sid learns that it’s natural for his banana to ripen and turn brown and mushy. Over time, fruits and vegetables decay!

When Sid’s shoes don’t fit, he declares that his shoes must be shrinking. Sid and his friends discover that it’s hard to see things growing, because growing happens slowly over time. It turns out Sid’s shoes weren’t shrinking -- he was growing!

Sid wakes up and discovers that his ice pops melted! This sticky situation leads him to ask,” Why do things have to melt?” After investigating at school, Sid learns that if liquids don’t stay in a really cold place, they slowly melt over time. He also discovers that liquids can freeze into solid ice and then melt right back into liquid.

Sid wants to know how his Grandma always makes perfect pancakes. They’re never too squishy or burnt. At school, Sid makes an important discovery -- heat changes things! This lesson reveals the secret of Grandma’s pancakes: she heats them on the stove for the perfect amount of time … not too much, and not too little.

Sid isn’t too thrilled that his favorite shirt shrunk, his shoes don’t fit anymore and his Mom changed his favorite toothpaste. He really wants to ask, “Why do things have to change?” Sid discovers that change is a natural part of the world as he and his friends review lessons learned from change and transformation such as decay, growth, and change caused by heat.

Sid notices that the tag in his shirt is really itchy, and he wonders why it isn’t soft like the rest of his shirt. At school, Sid and his friends explore and learn about the different textures around them: smooth, soft, bumpy and itchy…like his shirt tag!

Sid wakes up to his favorite smell in the world, pancakes. But the yummy scent is quickly taken over by a different smell when baby brother Zeke and his stinky diaper enter Sid’s room. At school, Sid learns how smells travel through the air and arrive inside the nose.

Sid tries on Grandma’s glasses, but they make everything look blurry. Sid explores his sense of vision, and discovers that even though Grandma’s glasses make things look blurry to him, they make things look clear to her.

Sid notices that when he covers his ears with his hands, everything sounds quieter. Maybe he has super powers! Sid explores his sense of hearing, and discovers that sounds travel through the air and into our ears. So it turns out Sid doesn’t have super powers, he was just blocking sound waves from entering his ears!

Sid wants to know about all his different senses. At school, Sid and his friends embark on a quest to explore vision, hearing, touch, smell, and taste!

Sid wonders if you really do have to brush your teeth every single day? At school, Sid discovers that our mouths are filled with different kinds of teeth that do lots of different jobs—like chewing our food! So it’s really important to keep our teeth healthy by brushing them every day!

Sid declares that he shall only eat Birthday cake for every meal! Sid and his friends discover that only eating cake would make their bodies feel terrible. Then they explore and learn that the best way to stay healthy is by eating nutritious food.

Sid’s parents tell him to wash his hands to keep away germs. But Sid can’t see any germs on his hands, so why should he wash them? Sid and his friends learn that germs are so small that you can’t see them. And they discover that a great way to stay healthy and keep germs away is by washing their hands with soap and water!

Sid decides to sit and watch television all weekend long. There’s just one problem with his plan: sitting around and not moving would make his body feel terrible. At school Sid and his friends learn that exercising is a really fun way to stay healthy! And it makes your body feel great!

Sid wonders what is the best way to always stay healthy? At school, Sid and his friends discover that there’s lots of ways to stay healthy: washing hands to avoid germs, eating nutritious foods, brushing teeth and exercising!

When a wheel falls off Sid's favorite toy truck, he tapes it back on. But now the wheel won't spin, and Sid wonders how exactly wheels work? At school, Sid explores how wheels are simple machines that help move all kinds of things like cars, trains, tricycles, and even toy trucks!

Sid wonders how he can lift up his big, heavy stuffed animal dinosaur onto his bed. Sid and his friends explore how inclined planes are simple machines that make it much easier to push up heavy things...including big stuffed animal dinosaurs!

Sid believes that he has discovered a new invention to put toys away! Sid learns his invention is actually a simple machine called a lever, which is not only useful for launching toys, but can also help lift up really heavy things.

Sid learns about pulleys while pondering how to move a box of toys to his tree house.

Sid pretends that his stuffed animal panda is going on an adventure to the top of the playground slide. Sid and his friends make a plan and use simple machines like wheels, inclined planes, levers and pulleys to get the panda all the way to the top of the slide!

When Sid hears dogs barking in his neighborhood, he wonders if they're talking to him. At school, Sid discovers that animals do communicate in lots of different ways, like using body language, making sounds, and barking! The episode features the introduction of Philbert, a dog adopted by Sid's Grandma.

Sid wonders why there aren't any birds living in the birdhouse he built with his Dad? Sid and his friends discover that lots of animals build and live in their own homes, like beehives, anthills, and bird nests!

Although dirt helps things grow, it is also filled with tiny rocks, pieces of leaves, bugs and worms.

Leaves are food for animals, they provide shade and they make nutrients that help flowers and trees grow.

It's a special day at school, it's Bug Club Day! Sid and his friends use their magnifying glasses and discover ants, rolie polies, and caterpillars around the playground.

Sid is supposed to have a playdate outside, but the forecast calls for rain! Sid isn't too happy and wonders if the rain knew he wanted to play outside? At school, Sid and his friends discover that rain actually comes from rain clouds! They also learn that rain is really important because it helps living things grow.

Sid is excited to play soccer with his Dad outside--but he's not excited to lather up in sunblock, because it takes way too long to put on! At school, Sid and his friends discover that sunblock is a great way to protect your skin from the sun. And they also learn about the amazing ways the sun helps the Earth.

Sid loves celebrating the winter holidays where he lives, because it's always sunny and warm. But this year, Sid and his family are visiting relatives where it's chilly and cold. Sid wonders why it can't be warm everywhere? At school, Sid discovers that temperatures are different all over the world!

Sid can't figure out who messed up the pile of leaves he raked up in the backyard. At school, Sid and his friends discover that wind is strong enough to make sand dunes, waves, move sail boats, and even blow away a pile of leaves!

Sid wants to be a weatherman so he can decide what the weather will be every day. Sid and friends investigate weather and learn that weathermen don't control the weather, but they do have to know all about rain, sun, wind, and hot and cold temperatures!

Sid declares that it's a special Mom Day, so he makes Mom French toast for breakfast. When Sid smells the French toast and his stomach growls, he wonders if his stomach is trying to talk to him. When Sid and his friends investigate at school, they discover that the stomach makes noise when it's getting ready for digestion.

When Sid's Dad tells him a really funny joke, Sid laughs so hard that his face hurts. Sid wonders why his face would hurt if the joke was funny? When Sid and his friends investigate at school, they learn that they have muscles all over their bodies, even in their faces!

Sid races around his room and finds himself breathing really fast. Sid then wonders where all the air is going in his body when he breathes in? At school, Sid and his friends discover that our bodies have lungs to help us breathe in oxygen!

When Sid's dog uses his foot to scratch his ear, Sid tries the same maneuver, but can't do it. Sid explores skeletons, and discovers that animals have different bones and joints than people, which allows them to do lots of cool stuff like swing from trees, fly in the air, or even scratch their ears with their feet!

When Sid figures out a new way to get ready for school super fast, Mom says to him, "Now that's using your brain!" Sid wants to know that means, and discovers that the brain controls all kinds of things like walking, thinking, breathing, and getting ready for school!

It’s vaccination day at Sid’s school, and Sid and his friends are a little apprehensive about getting a shot. Thankfully, a very special nurse will be giving the kids their vaccination—Sid’s Grandma! Throughout the special episode, Grandma, Teacher Susie, Mom and Dad all do their part to make vaccination day a fun learning experience filled with music, games and lots of laughs.