Search every subject world, from Preschool to Grade 12. The first five courses of every subject path are free.
8 courses
Science · Grade 1
First graders plan a real investigation: which ball bounces highest? They learn which questions can be investigated, the steps of a fair investigation, the tools scientists use to measure and record, and how to answer a question with a claim backed by evidence from a data table.
Science · Grade 1
Why can't you see your toy in a dark closet? Learners discover that we see objects only when light shines on them and reaches our eyes. With a flashlight test they sort materials that let light through, let some light through, block light and make shadows, or bounce light like a mirror, then use their evidence to choose materials for curtains, windows and a shadow-puppet screen.
Science · Grade 1
Learners twang a ruler, stretch rubber bands and watch rice jump on a plastic-wrap drum to gather evidence that vibrating materials make sound and that sound can make materials vibrate. A string simulation shows how shorter or tighter strings vibrate faster and sound higher, and a harder pluck makes a louder sound.
Science · Grade 1
Lighthouses, sirens, traffic lights and whistles all send messages across a distance. Learners sort light and sound signals, invent a flash-and-beep code and decode messages, then build a cup-and-string phone, test it and use the results to improve it. They finish by choosing the best signal for new situations, such as calling a friend around a corner.
Science · Grade 1
Roots, stems, leaves and flowers each do a job for a plant. Beaks, claws, shells, fins and fur each help an animal find food, stay safe, move or sense the world. Learners label plant parts, sort animal parts by their jobs, and explain how the shape of a part fits its job, from an eagle's hooked beak to a duck's webbed feet.
Science · Grade 1
A kitten grows up to be a cat and an acorn grows into an oak tree: young living things are like their parents. But the kittens in one litter don't look exactly alike. Learners compare parents and offspring, find what is the same and what varies, and discover how parents and offspring behave in ways that help the young survive, from penguins warming eggs to ducklings following their mother.
Science · Grade 1
The sky follows patterns we can predict. Learners track the sun rising in the east and setting in the west, watch the moon's shape change over about a month, explain why stars are visible at night but not in the day, and read a year of daylight data to discover that summer days have more hours of daylight than winter days.
Science · Grade 1
Plants and animals have parts that solve problems: shells protect, webbed feet push water, thick fur keeps out the cold. People copy these ideas to solve human problems, from helmets to hook-and-loop fasteners inspired by sticky burrs. Learners match inventions to the nature ideas behind them, then design a 'duck-foot' paddle glove, test it against a bare hand and use the results to improve it.
