
Stem cell researcher and PhD student Marissa Lithopoulos has volunteered with the Let’s Talk Science outreach program since 2014. The University of Ottawa chapter of this national program celebrates its 25th anniversary this year. Photo by Zhaoyi Chen.
Marissa Lithopoulos has always had a passion for science.
“My favourite show growing up was ‘Bill Nye the Science Guy.’ I knew I wanted to be just like him one day.”
Lithopoulos began delivering hands-on science activities in classrooms as part of the Let’s Talk Science outreach program in 2014 and has been hooked ever since.
“I started by visiting elementary schools and, to the kids, it’s like you’re a magician,” said the PhD student, who works at The Ottawa Hospital. “You’re making volcanoes and slime in the classroom, and the students are super-excited. They just look at you with a sparkle in their eye like, ‘Wow, you’re a scientist!’”
Lithopoulos is one of 254 active volunteers from the University of Ottawa chapter of Let’s Talk Science, which celebrates its 25th anniversary this month.
From volcanic eruptions, Lithopoulos moved into educating high school students about her own area of expertise: stem cells. She also collaborated with fellow PhD students and stem cell researchers Will Chen, Zhaoyi Chen and Tanya Foley to organize an annual symposium called StemCellTalks for high school students that focuses on stem cell biology, policy, and ethics. Cancer researchers Marie-Ève Wedge and David Cook also organize a similar symposium called Let’s Talk Cancer, in addition to arranging dozens of hands-on tours through The Ottawa Hospital’s cancer labs.
Begun at Western University, the now-national science outreach program was launched at the University of Ottawa in spring 1993 by Dr. Barbara Vanderhyden, a senior scientist at The Ottawa Hospital and distinguished professor at the university. She established the “Let’s Talk Science Outreach program” with the goal of helping students in the science, technology, engineering and mathematics fields improve their communication and teaching skills.
“Not only does the program teach kids about science from trusted university sources, but the hope is that they may appreciate the importance of science in their everyday lives – and it may even inspire them to enter the profession themselves,” said Dr. Vanderhyden.
Let’s Talk Science volunteers from Ottawa have won 24 national awards and recognition in the past decade, and the program itself has earned many national awards for it’s hands-on, interactive and in-person approach.
While stem cells hold a lot of promise, few proven treatments are currently available. Many fraudulent companies exploit the hype by selling treatments that aren’t based on scientific evidence.
“Many researchers, particularly in Canada, are doing amazing things with stem cells, but it’s important to acknowledge that there is some bad science out there in the world,” said Lithopoulos. “I think it’s our responsibility as stem cell experts to educate the public about what stem cells can and can’t do.”
In addition to having fun and learning leadership and event-planning skills, Lithopoulos finds her outreach work humbling. Sometimes students will ask thought-provoking questions that make her see her work in a different light.
“We want to convey to students that science is more about asking the right questions, rather than always having the right answers,” said Lithopoulos. “The goal is to get students to think, not to tell them what to think.”
Learn more about Let’s Talk Science.

Support patient care and research at
The Ottawa Hospital
You might also like…
Respirologist answers FAQs about cystic fibrosis
Cystic fibrosis (CF) is the most common genetic disease affecting children and young adults in Canada. Respirologist Dr. Shawn Aaron provides an overview of CF, including causes, symptoms, and the remarkable improvements made in life expectancy over the years.
5 things to know if you or someone you love is dealing with infertility
Around the world, one in six couples struggle to make their dreams of parenthood a reality. Dr. Jenna Gale, a specialist in reproductive endocrinology and infertility, shares advice to help you or a loved one on the fertility journey.
Understanding rabies: Risks, vaccination and what to do after a bite
Although rare in Canada, rabies is almost always fatal once symptoms appear. Infectious diseases expert Dr. Michaeline McGuinty shares how rabies is spread, when to get vaccinated and what to do after a bite.
Do you have a surgery coming up? Here are five “prehab” tips to help you recover faster
You’ve probably heard about rehabilitation, but what about “prehabilitation”? Prehab is all about getting your body and mind in top shape before surgery so you can enjoy a smoother, quicker recovery. Discover five essential prehab strategies from researcher Dr. Daniel McIsaac.
By thinking differently, this research team is improving the lives of people with cancer
Taking a different approach to clinical trials, the REthinking Clinical Trials (REaCT) program aims to answer some of the most important and practical questions that affect both patients with cancer and our health-care system. Find out what sets REaCT apart and makes the program so special to participants like Beth.
Watch: What you need to know about coronary artery disease
Coronary artery disease is the most common form of heart disease and one of the leading causes of death worldwide. In this video, Cardiologist Dr. Nadine Gauthier shares risk factors, symptoms, treatment options and how to adopt a heart-healthy lifestyle.