A l’escola aprenem les Ciències Naturals en anglès de 3r a 6è de primària (projecte CLIL).


STEM Challenge #10: Hibernating bears


These short, cold days of winter many animals experience a process called hibernation. For example: squirrels, groundhogs, bats, turtles, snakes or bears.

Previously, they prepare a nest where they “sleep” for a long period of time. Some animals wake during hibernation to eat and relieve themselves, while others sleep through the entire winter.

STEM Challenge #10 engages pupils to:

“Design and build a nest for a hibernating bear”.


Building time: 40 minutes.

Pupils should consider some criteria and restrictions. For example: nests must have an entrance/exit or bears must be protected from the rain, snow and wind.


Hello, how are you?

3rd Graders are ready to present you their new STEM Challenge:

“Build a strong bridge that crosses a river and allows boats to sail below it”.

Materials: straws, popsicle sticks and 50cm of masking tape.

Building time: 30 minutes.

First iteration pictures:

Next day, we are going to study bridges in depth so that we can build stronger bridges. So, don’t forget to visit us!

STEM Challenge #7: Bones bridge!


Here there is another (Halloween) STEM Challenge:

“Build the longest and strongest possible BONES BRIDGE”

Pupils were given 25 minutes and the following material:

At first, they found the challenge pretty hard. It was difficult to build a stable bridge and capable of supporting weight.

Pupils needed some extra advice. So, they watched the following video and we talked about it in class:

The next day, all the groups improved their bridges. Look:

6th A Bridges

                                                                      6th B Bridges

STEM Challenge #6: Spider catcher!

Hello, everyone!

He-heeeee, it’s Halloweeeen!!!!!

STEM Challenges are always great. They help develop our students’ building skills, group-work abilities or design thinking, among other capacities.

This week, taking advantage of Halloween, we decided to challenge our pupils the following way:

“Design and build a SPIDER CATCHER”.

We can assure that it is more difficult than it seems!

Pupils were given the following material:

In small groups, they had 20 minutes to build a spider catcher with a surface of 25x25cm.

Once they got the Catcher (or after 20 minutes), a member of another group should throw spiders all over the device. Then, pupils should raise it carefully and see how many spiders remained caught:

STEM Challenge #5: Map your brain!

Hi, children!

In 3rd Grade, we are learning about our senses, so this challenge is focused on the sense of TOUCH.

We wanted to know which body parts are more sensitive and we found an experiment developed by Dr. Rebekah Corlew and Theo Walker of the Fitzpatrick Lab at the Max Planck Florida Institute for Neuroscience. This experiment is called The Homunculus Mapper.


First, we made this card:

Then, in pairs, we took measurements:

  1. The tested pupil should close their eyes.
  2. The tester pupil should press 2 points of the card against the skin of the subject and ask if they feel one point or two points. The tested body parts are: HEAD, BACK, ARMS, HANDS, LEGS and FEET.
  3. Start with the largest distance and keep testing smaller and smaller distances until the subject indicates that they feel one point.
  4. Record these distances.
  5. Enter these numbers on brainmapper.org.

Finally, we entered our results on the web. The more sensitive parts looked larger and the less sensitive parts looked smaller. This is how “our brain thinks we are”. For example:

It was an interesting experiment and very easy to do at home 😉

STEM Challenge #3: Fruit towers!

Hi, everyone!

We are very happy to show you our STEM Challenge number 3: Food Towers, solved by 3rd Grade pupils. Again, we got the idea out of Feel Good Teaching, by Kerry Tracy.

Students were challenged to build a tower using school supplies, following some criteria. For example: at the top of the tower, there had to be a piece of food; or, towers should be as tall as possible.

Materials provided:

Building time: 30 minutes.

The next week, pupils tried to solve the same challenge again. Clearly, all of the groups improved their towers!

STEM CHALLENGE #1: Fruit race

Hello everyone!

In Sceince, this year we’re going to learn with STEM Challenges!

The idea for the first STEM Challenge for 6th Grade has been taken from the great Kerry Tracy, from Feel Good Teaching (thanks for sharing ;)), and is called FRUIT RACE.


Students were challenged to build a fruit-balanced device, in teams of 4. This device had to be put on their heads in order to participate in a teams race. Pupils could not touch the fruit while racing.

First-iteration devices

It has been a great opportunity to introduce engineering activities in the primary class.

It is good to do a second iteration, so that student can reflect and improve their initial machines:

Second-iteration devices

And they were our winners in the race: