Water and sand
This colourful sand is dyed and coated to repel water, so it's always dry, even when it’s submerged! Scientists would say that the sand is ‘hydrophobic’, which translates as water fearing. You can mould this hydrophobic sand into structures under water, and then simply drain off the water to reuse the sand.
For your chance to win a test tube of hydrophobic sand from www.entropy.com.au
, send us a tongue twister you have made up about sand.
Test tube filled with blue hydrophobic sandColourful Entropy logo with a toy caterpillar whose head forms the 'o' in 'Entropy'
How to enter
To be in the running to win this fantastic prize, send us your entry with your name, age, address and Double Helix subscriber number*. Get a parent's permission, ask them to sign each piece of paper, and then send it to CSIRO Double Helix Competitions, GPO Box 1700, Canberra ACT 2601 by 14 July 2018. Or, email your entry with your details to firstname.lastname@example.org
. The best entries in each competition will win the prize.
*Don't know your subscriber number? Check the address label that came with your magazine or subscribe now.
Terms and conditions of entry
To be valid, all entries must include name, address, age of entrant and Double Helix subscriber number.
All entries become the property of CSIRO and will not be returned.
Entering the competition assigns copyright to CSIRO.
Entries will be judged on creative merit, not by chance.
Age will be taken into consideration when judging.
All decisions on competitions are final and will not be discussed further.
Winners will be notified by mail and the names of competition winners only will be published three issues later.
CSIRO shall not be liable for any damage or loss suffered in connection with any of the prizes.
Any change in value of the prize between the publishing date and the delivery date is not the responsibility of CSIRO.
In the case that prizes become unavailable after the publishing date, CSIRO will send an alternative prize.
The closing date for this issue's entries is 14 July 2018.
Competition entries must be the entrant's own work.
It is the responsibility of the entrant to ensure copyright of their entry is not assigned elsewhere.
Winners should allow six weeks for prize delivery.