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In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.

These three short activities challenge groups to fit objects through paper and index cards: "Slots" presents the challenge for one learner to figure out which objects fit through a hole cut by another

Are balloons porous or non-porous? In this activity, learners watch an entertaining Mr. O video and conduct a simple experiment to find out.

In this activity (7th activity on the page), learners use their sense of touch to identify mystery objects hidden in socks.

In this technology activity, learners explore digital imaging and pixels. Learners "transmit" an image to a partner by creating an image on grid paper.

This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.

In this math game, learners try to earn the most points by winning stacks of four dice. Learners practice number recognition and addition skills.

In this math activity, learners play a number game to explore the relationships between numbers, combinations, and the concept of equivalency.

In this "Sid the Science Kid" activity from Episode 103: Enough With the Seashells!, learners practice estimating numbers of objects (like shells) and then check their estimates by counting.

In this activity, learners use number sense and mental math strategies to estimate the price of a sign.

In this activity, learners work in partners to create and exchange messages written in Braille. Learners use a Braille key and thumbtacks to write their messages in Braille.

In this online brain stumper, the bottom half of a series of letters is covered. You may think you know what it says, but remove the black bar to see if you're right.

This game for one to four players uses a deck of cards to develop mental addition skills.

In this activity, learners examine their tongue and taste buds.

In this math activity, learners estimate how many pennies are in a jar by predicting and counting handfuls of pennies.

In this math activity, learners play a game in which every roll can earn you counters, but if you roll the wrong number (6), you have to put everything back.

This assortment of mathematical games can be played while traveling.

In this activity, learners build a simple pinhole viewer. They use this apparatus to project images from a variety of light sources, including a candle, the Sun, and the Moon.

In this activity, learners work in teams to study the observation skills essential to scientific research.

In this activity (9th activity on the page), learners work in pairs to see how their perception of touch differs from reality.