Objects are only visible if they give off their own light or if an external light shines on them.

Light can be used to warn of danger.

Light interacts with different materials in different ways.

Opaque objects in a beam of light cause shadows. Shadow size and shape can be changed.

Light interacts with different materials in predictable ways.

Animals have external structures that interact with light to help them survive.

Interactions between light and materials can be used to keep people safe.

Humans can design solutions by mimicking animals.

Light can interact with material to make an object visible.

Appropriate materials can be selected to make an exit door path visible. 

The Sun and Moon can be visible during the daytime and the Moon and stars can be visible at night.

We see objects when light shines on them.

We see objects when they give off their own light.

We see the Moon because light shines on it.

The Sun appears to move across the sky in an arc pattern.

The Moon appears to move across the sky in an arc pattern.

Data can be represented by symbols in an investigation.

There is more daylight in the summer and less daylight in the winter.

At certain times of year, it can be dark when kids arrive at or leave school.

Objects that give off light can help kids see and be seen in the dark.  

Living things can be categorized using patterns of similarities and differences.

Young and adult plants look very similar but are not exactly the same.

Young and adult animals look very similar but are not exactly the same. 

Individuals within a species have variation but are recognizable as that species.

Parents and offspring behave in ways that help offspring survive.

Animal behavior has predictable effects.

External body parts of plants and animals help them survive. 

People can design solutions that mimic plants and animals to solve problems.

Animal behavior and external body parts help plants and animals survive. Part 1

Animal behavior and external body parts help plants and animals survive. Part 2