Ada and friends brainstorm ways to unlock the door to her brother's backyard fort.

The kids use the scientific method to prove Mooshu Kitty's innocence.

A power outage zaps Ada's plans for the "perfect" movie night.

Rosie’s Great Aunt Rose is coming, and she loves banana bread — time to get peeling!

The friends whip up a tasty solution when Mom Twist forgets her anniversary.

Ada, Rosie and Iggy work together to revive the Pecks' wilted garden.

The kids examine what a bird's nest is made of so they can build a new one.

Ada and pals invent a gizmo to help an exhausted Arthur get more sleep.

The power of observation helps Rosie and the gang tune an old piano for a living room recital.

Rain forces the kids to rethink their outdoor party plans.

Ada and friends follow their noses and discover the source of a bad smell: Arthur’s tennis shoes!

Taking a "brain break" helps the kids solve a problem.

It's science to the rescue when Arthur's pet lizard goes missing.

The kids work together to get Mooshu — and Arthur's toy helicopter — down off the roof.

Ink disappears right before Ada's eyes, but was it magic... or science?

The friends help Arthur figure out why he can’t score a goal in soccer.

Ada and company construct a parachute, using eggs as crash-test dummies.

The kids learn to pivot when their plans to build a snow fort don't pan out.

When Arthur claims the Twist Family Egg Hunt is too easy for him, Ada vows to make it egg-stra challenging.

Iggy’s on a mission to make his kite fly.

Iggy designed an awesome skate park but has more fun watching his friends enjoy it.

The kids build a high-tech nurse bot to help Mom Twist fight the flu.

Rosie's convinced she needs bigger muscles to karate chop her way through a wooden board.

The kids make a metal detector to find a missing time capsule.

Rosie wants to win the Raucous Riveters Reunion Race — but something's wrong with her car!