St Patrick’s Day

Every 17th March people of Irish heritage celebrate St Patrick’s Day as he is regarded as the Patron Saint of Ireland. They usually wear green clothes, put up green decorations in houses or offices, and even paint sights and monuments all over the world emerald green (just temporarily!).


St Patrick’s day Parade San Francisco 2015 – ©David Yu (under CC licence)

This festival is a wonderful opportunity for you to do some research on Ireland and discover some really amazing landscapes and interesting traditions:

One of the most famous traditional Irish songs:Molly Malone:
Two Irish sports:

You may also remember that Irish people can choose between English and Irish. Would you like to try learning some Irish? If so, you can start with some basic greetings here.



Happy Pi Day!

piHappy Pi Day! Every March 14th (3/14 using the day/month format used in the U.S. to write dates) mathematicians and students around the world celebrate pi, which is a very special number. Pi (the Greek letter “π”) is the symbol we use in math to represent the ratio of the circumference of a circle to its diameter, which is equal to approximately 3.14. That’s why we celebrate pi day on March 22—the date 3/14 has the same digits as the first three digits of pi! But the number pi actually goes on for quite a while. It’s more like 3.14159265358979… the numbers after the decimal point continue forever, without any pattern. In fact, pi has been calculated to over one trillion digits beyond the decimal point. I’m glad I don’t need to memorize that for an exam!

Physicist Larry Shaw celebrating the first pi day in San Francisco in 1988.
Physicist Larry Shaw celebrating the first pi day in San Francisco in 1988.

The first large-scale pi day celebration took place in 1988 in San Francisco, my hometown. It was organized by physicist Larry Shaw, who was working at a science education museum called the Exploratorium. The staff of the museum, as well as visitors from the public, celebrated by walking around in circles and eating fruit pies—because pies are round, like circles, and because in English “pie” and “pi” are homophones. That means the words, when spoken, sound exactly the same.

Many people eat pie on pi day.

Today, pi day is still celebrated by eating pie, reciting as many digits of the number pi as you can remember, and solving math problems that involve the constant pi.

Physicist Albert Einstein
Physicist Albert Einstein

And one additional fun fact: Albert Einstein’s birthday is also 3/14. So in some places, people also hold contests to see who can dress up to look most like the famous physicist!


International Women’s Day

Happy International Women’s Day! Since the 1970s, the United Nations has been celebrating International Women’s Day on March 8th to honor the achievements of women all around the world as well as to raise awareness about how women still face many unjust challenges simply because they are women.

This year, the theme of the day is “Planet 50-50 by 2030,” which is in line with the UN’s Sustainable Development Goals. The SDGs include numerous goals related to reducing gender inequality (in addition to other issues) that all the countries of the world have committed to achieving by 2030.

Check out these three inspiring videos related to International Women’s Day. The first one gives some statistics about the current status of women and girls around the world and the challenges that many still face today. It then shows how the SDGs will hopefully improve the situation of women and girls around the world by 2030.

The second video celebrates the working women of the world, especially since not long ago, it was rare to find women in the workforce. It also highlights some of the many inventions and innovations women have pioneered over the years.

The third video, on the homepage of Google today, celebrates the women engineers, educators, leaders, movers and shakers of tomorrow. Google visited 13 cities around the world (San Francisco, Rio de Janeiro, Mexico City, Lagos, Moscow, Cairo, Berlin, London, Paris, Jakarta, Bangkok, New Delhi, and Tokyo) and asked 337 girls and women to complete the sentence “One Day I Will…” Then, they made this video.

Today, try to find a time to show your appreciation for the women and girls who have inspired you and influenced your life!

Leap Year

Happy March! You may have noticed that this past February we had an extra day—February 29th. That’s because 2016 is a leap year. Every four years, we add an extra day to February because our normal 365-day year isn’t quite long enough to match up with the exact amount of time it takes the Earth to make one full rotation around the sun. But, it’s actually a bit more complicated than that. Check out this video of Neil DeGrasse Tyson, an American astrophysicist and author, explaining how leap years work and why we have them.