How Tall Is Your Tree?

Post by Helaine Becker

How tall is your Christmas tree? Or any tree for that matter?

Use this  fun and super easy STEM activity to find out any tree's height without a ladder. It relies on trigonometry!

1. Get on your knees and put the top of your head on the floor.
2. Look  through your legs at your tree. Can you see the tippy top?
3. If not, move away from the tree until you can.
4. Mark the spot where your head is touching the ground.It's the same distance from the tree as the tree is tall!

What happens to creatures that live in the ocean if seawater becomes more acidic? This fun activity, excerpted from The Big Green Book of the Big Blue Sea (Kids Can Press), is an easy to do, seeing-is-believing demonstration.

Humpty Dumpty Coral

Excess carbon dioxide from burning fossil fuels, is gradually making the oceans more acidic. How might more acidic waters affect coral reefs? See for yourself.

You Will Need

an egg

500 ml (2 c.) white vinegar

a large glass container (to hold the vinegar)

plastic wrap

1.     Break the egg neatly in half. Reserve the egg white and yolk for another purpose (like breakfast!).

2.     Measure the vinegar into your container. Place the two halves of the eggshell in the vinegar. Cover the container with plastic wrap.

3.     Watch what happens when you place the shells in the vinegar. Do you see bubbles forming around the shells?

4.     Leave the container in an area where it won’t be disturbed. Then check on your eggshells three days later. Where did they go?

What’s Going On?

Eggshells are made out of calcium carbonate, the same mineral that coral polyps use to make their shells. Vinegar — an acid — reacts with the calcium carbonate, removing the carbon from the shell. The carbon combines with oxygen to make the gas carbon dioxide. Those are the bubbles you saw rising from the egg.

With no carbon left in the shell, the shell literally dissolves and disappears. What you see floating in the vinegar is just the soft membrane that lines the eggshell. It is similar to the soft bodies of the corals. Like the egg membranes, the coral bodies would float off without their calyces. They’d be totally vulnerable to predators.

What’s Happening Now?

Despite their tiny size, corals build structures that are so gigantic they can even be seen from space! To do so, they need just the right conditions. They need water that is the right temperature, clarity and acidity. They need to remain undisturbed. And they need the right kind of base to lay the foundation for the reef.

Today, reefs are at risk all over the world. Global warming, ocean acidification, pollution and habitat destruction are all taking their toll. So people are lending corals a helping hand. The Reef Ball Foundation, for example, is a non-profit organization dedicated to building artificial reefs.

The foundation makes ball-shaped, concrete structures. They lower them in waters where an existing reef has been damaged. Teams of scientists hand “plant” about 500 corals per day onto each structure. The scientists then monitor the growth and health of the corals until the reefs re-establish themselves. The process can take 3–5 years. Since their founding in 1993, the Reef Ball Foundation has helped rebuild coral reefs in more than 70 countries.

 

The Big Green Book of the Big Blue Sea has been longlisted for the Information Book Award from the Vancouver Children's Roundtable.

Massive open-house of thousands of laboratories across Canada coming May 11!

By Pippa Wysong

What has a million legs, a few thousand open doors and things that make you go ‘ooh!’ and ‘aww!’? If you said Science Rendezvous, you’re right! This is a nation-wide event that will take place Saturday May 11, and it’s for the whole family.

What is Science Rendezvous? Think of it as a massive open-house where thousands of laboratories across the country open their doors to the public. The whole family can visit labs at universities and other institutions and see where real research is done. You can meet scientists who will answer your questions, give tours of their labs, and do demos – many of which you can try out yourself.

Explosive fun from Science Rendezvous 2012.
For more blasts (and other stuff) from the past,
check out Science Rendezvous's video gallery.
Photo courtesy of Science Rendezvous.

I ventured into the Science Rendezvous festival the last two years, and found it an amazing experience. I got to talk to geologists, astronomers of various types, and even spoke to a researcher working with flat-worms who was trying to figure out what it is that makes these creatures grow new body parts and be basically immortal. (Read a previous blog I wrote about it.)

This year, I’ve gotten involved. In fact, I’ll be at this year’s event all day, hosting a vaccine education tent that will be on the University of Toronto campus on St. George Street. Look for the tent where people are handing out surgical masks and letting you visit our actors portraying people sick with diseases such as Spanish flu, polio and smallpox.

There will be things that appeal to all ages. Across Canada, there will be experiments and activities for the kids, lectures for the adults, and displays for people of all ages. And not everything is indoors. There will be tents erected on university grounds where various demos and exhibits will reside and contribute to a festival atmosphere.

There will be even be science activities at a shopping Mall! Cape Breton University is hosting the Mall of Science at the Mayflower Shopping Mall where there will be a variety of hands-on activities.

Toronto has 17 venues participating, including 4 universities, 2 hospitals, research centres, libraries, and the Ontario Science Centre.

This is the only science festival of its kind in Canada, and the biggest. What makes it different from other science outreach events is that it’s the only one where the public gets direct access to real-live researchers and their labs, and find out exactly what novel areas they are working on. Other science outreach groups mostly focus on doing hands-on experiments that demonstrate basic scientific principles.

To find out more, tune in to the Discovery Channel’s Daily Planet show. Each day for the week leading up to May 11, scientists participating in Science Rendezvous will be on the show describing and showing off a tiny sampling of the things you’ll experience.

Mark May 11, 2013, on your calendar now! Here are some highlights of things to come:

• Science on Stage at Toronto’s Yonge-Dundas Square, Ontario. With Daily Planet’s Dan Riskin. Ryerson University hosts the Science on Stage event at Yonge-Dundas Square in Toronto. See the ever-popular Sumo Robot Competition, a machine-vs-machine battle to the death, the Dance of Science featuring Ryerson’s renowned performing arts programs, and a spectacular fire show! Dan Riskin will host and do some amazing science himself!

• The Role of Gender in Science Communication, Vancouver. As a prelude to the main event happening on campus, University of British Columbia (UBC) will present a public lecture on the role of gender in science communication on May 10th, 2013 from 5:30-7:00pm. Open forum and panel discussions will be led by Dr. Jennifer Gardy from UBC. On May 11, UBC labs will open their doors.

• Science Jeopardy, Oshawa, Ontario. The University of Ontario Institute of Technology (UOIT) presents flaming gummy bears, liquid nitrogen fun and Science Jeopardy. Examine forensic evidence to solve a crime scene, levitate a magnet, discover the sensational sliminess of creating polymers, create a Maggot Masterpiece, and isolate your own DNA.

And much, much more!
For more details: http://www.sciencerendezvous.ca/2013/