The Danger Of Relying On Abstractions

The author used the Learning Pyramid (claiming 10% lecture retention, 90% teaching others) in an article, later discovering it's a myth with no scientific evidence. Edgar Dale's original Cone of Experience had no numbers. The NTL Institute claimed the numbers were real but never provided proof. The internet repeats misinformation because sources copy each other without verifying originals. This is like the telephone game: errors accumulate. Relying on abstractions like unverified online sources is dangerous. Always check original research before using such data.