This may prove challenging for the person you've chosen. If this is the case, then choose the contribution that had the greatest effect on the world.
For example, some would say the significant contribution for Albert Einstein would be his Theory of Relativity. However, he also had MANY other contributions that were just as important.
If you find yourself having trouble deciding, choose the one you believe had the greatest impact on humanity.
Be clear and concise
Include as much detail as possible to ensure the viewer understands the significance of the contribution
Include related images: you may include any pictures, primary source videos (ex: an interview with the scientist), or graphics and tables that relate to the scientist
All resources must be included in your bibliography
What events in the scientist’s life or exploration led to the discovery?
Were there any other people in the person’s life that helped contribute to the discovery?
How has the contribution changed the way humans understand science, the world, etc.?