Some of you might already know about the existence of some incorrect information in the field of education, educational technology and instructional design.
Have you ever seen a statement similar to "Students remember 10% of what they read, 20% of what they hear, 30% of what they see, 50% of what they hear and see, 70% of what the say and write and 90% of what they do"? It is most commonly associated with Dale's Cone of Experience (Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8, Example 9 and Example 10) but did you know it's a completely unfounded statement? Dale's Cone of Experience is legitimate but the associated statement with percentages is not the result of any study published in any refereed journal in the field. So it's essentially bogus!
This article from the Work Learning Research group does a great job at summarizing this particular tidbit of incorrect information. It's a real lesson learned for educators like us; go to the primary sources and make sure what you're quoting is in fact true!