Idag skal du lære om støv! Ted-ed film af Mette Ilene Holmriis
TED-Ed
What is dust made of? Where does it come from? Get the dirt on dust:
https://ift.tt/2IQF9ON
TED-Ed
What is dust made of? Where does it come from? Get the dirt on dust:
https://ift.tt/2IQF9ON