Changing Scientific Knowledge
Evaluate competing scientific explanations about dinosaurs by weighing fossil evidence — understanding that scientific knowledge changes as new fossils are discovered and new methods of analysis are developed
What a learner can do afterwards
- Give an example of a scientific idea about dinosaurs that changed when new evidence was found
- Explain that different scientists may interpret the same fossil evidence differently
- State that the best scientific explanation is the one supported by the most evidence from multiple sources
The lesson
Long ago, scientists pictured dinosaurs as slow, dull-colored reptiles that dragged their tails on the ground. That picture came from the fossils and tools people had at the time. As new fossils turned up and new methods let scientists study bones in finer detail, the picture changed.
In the 1990s, fossil hunters in China found dinosaur skeletons with feather traces preserved in the rock. Before that, most scientists pictured dinosaurs as scaly, like lizards. The new fossils showed that many dinosaurs, including close relatives of birds, had feathers. Scientists updated their picture because the evidence demanded it.
When two scientists disagree about a fossil, that does not mean one of them is wrong on purpose. They may be reading the same bones in different ways. The stronger explanation is usually the one backed by evidence from many fossils and many studies, not just one opinion.
Scientific ideas about dinosaurs change as new fossils and new methods bring in stronger evidence.
Watch it
Where it sits
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.