Growing Body Parts Jar

Anatomy STEM Kit

(1 customer review)
  • 1/2 Gallon Jar (1.89 L)
  • Large specimen jar filled with growing body parts, including one brain, one hand, one nose, one ear and one foot.
  • Each body part begins around 2 inches in length and grows to human proportions or bigger over the course of a week.
  • This kit is an essential for any young scientist’s at-home laboratory.

In stock


SKU: 800473

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Growing Body Parts Jar – Half Gallon
  • Large specimen jar filled with growing body parts
  • Each starts out about 5 cm (2 in) in length & grows to human proportions… or a little bigger in 7 days
Growing Body Parts Jar – Half Gallon

Growing Body Parts Experiment

An Essential for the At-Home Lab

When kids think of scientists, they think of strange specimens floating in jars filled with murky liquid. These jars come with a brain, hand, foot and even an ear. The best part is that these body parts start small and grow bigger the longer they stay in the water, until they reach their maximum size.

How Big Do They Grow?

Each body part starts out around 2 inches in length and grows to human proportions or a little bigger. The body parts should reach their maximum size after seven days of pickling in water. In this kit, you’ll receive a half-gallon, wide-mouth specimen lab jar made out of clear plastic, perfect to hold your young scientist’s growing body parts.

How Does It Work?

Growing body parts are made with two different polymers: a hydrophilic, superabsorbent polymer and a hydrophobic polymer.

Growing Body Parts Jar – Half Gallon

A Perfect Science Gift!

Steve Spangler’s Growing Body Parts Jar is the perfect gift for that “special” someone who has everything – give them a “hand”, lend them a “brain”.

These Polymers Can Absorb as Much as 250 Times Their Weight in Plain Water

The hydrophobic polymer does not absorb water at all. This polymer holds the shape of the part while it absorbs water (stretches) and as it loses water (shrinks) through evaporation. It also acts as a “skin” to keep the part from turning into powder as it dries.

Growing Body Parts Jar – Half Gallon

Comes With an Activity Guide

The kit includes an Activity Guide with a detailed explanation of how the growing body parts work… just in case you’re feeling the need to teach some ghoulish science.

What’s Included?

  • One brain, hand, nose, ear and foot
  • One 1/2 gallon (1.89 liters), clear plastic jar with sealable lid to keep your creepy things contained
  • Activity guide

Gross Out the Whole Class

Science doesn’t always need to be serious. Sometimes, it can be fun or even mischievous. You can gross out the students in your class while teaching them a valuable science lesson with the Growing Body Parts Jar from Steve Spangler Science. This jar comes with a small brain, a hand, a nose, an ear and a foot that will grow to real anatomical size after soaking for seven days in water. You’ll also get a large jar to store the body parts so that the classroom looks like a scary forensic lab. The magic of hydrophilic and hydrophobic polymers working together helps the body parts stay in shapes as they grow. The hydrophilic polymer soaks up the water so the body parts grow, while the hydrophobic polymer, which repels water, helps the parts to maintain their shape.

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Customer Reviews

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1 review

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What others are saying

  1. Sandra

    Great experiment for older kids!

    Sandra (verified owner)

    Perfect mix of cool and gross for older kids. They really do grow to life size ….or bigger! Great experiment my 12 year old plans to display in his room and freak out his friends! Look cool with green dye and black light too.

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  2. Question


    What happens to the body parts when you remove them? Do they stay the larger size? Are you able to keep them to use for a body study or do they fall apart?

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