4 Science claim verifications about humans humans ×
“Humans systematically overestimate short time intervals.”
The overestimation of short time intervals is one of the most replicated findings in time perception research, grounded in Vierordt's Law (1868) and confirmed by a large-scale 2023 study of ~24,500 participants. However, the claim's unqualified use of "systematically" slightly overstates the pattern's universality. Under specific conditions — high cognitive load, certain task structures, or neural adaptation — the bias can reverse to underestimation. The phenomenon is best described as a dominant tendency rather than an unconditional rule.
“Animals can develop allergic reactions to humans.”
The claim is largely accurate. Multiple veterinary dermatologists and biomedical sources confirm that animals — particularly dogs and cats — can develop allergic reactions to human dander (shed skin cells and hair proteins). The underlying immune mechanisms are well-established. However, such allergies appear to be uncommon, prevalence figures vary widely depending on the study population, and diagnostic testing has limitations. The claim is valid but would benefit from noting that these reactions are rare and specific to human dander rather than to humans broadly.
“Humans use only 10 percent of their brain capacity.”
This is one of the most persistent myths about the brain, but it is definitively false. Modern brain imaging (fMRI, PET scans) shows that humans routinely use all parts of their brain — not just 10%. Even during rest, widespread neural networks remain active. Harvard Health calls the claim "100% fiction," and MIT's McGovern Institute confirms we use our entire brain every day. The brain consumes roughly 20% of the body's energy, which would be biologically wasteful if 90% were unused.
“Humans use the left hemisphere of the brain primarily for logical thinking and the right hemisphere primarily for creative thinking.”
This claim is a well-known neuromyth. While some hemispheric specialization exists — the left hemisphere contributes more to language processing, for example — modern neuroscience consistently shows that both logic and creativity involve extensive collaboration between both hemispheres. Large-scale fMRI studies find no evidence of global hemispheric dominance for these functions. Creativity in particular relies on bilateral brain networks, and some studies even show increased left-hemisphere activity during creative tasks. The word "primarily" makes this claim false.