“The gravitational force is the oldest force known to man and the least understood.”
[P. Van Nieuwenhuizen, Supergravity, Volume 68, Issue 4 of Physics reports, North-Holland Pub. Co., 1981, 4]
Peter van Nieuwenhuizen is a Dutch physicist. He is now a distinguished Professor at Stony Brook University in the United States. Van Nieuwenhuizen is best known for his discovery of supergravity with Sergio Ferrara and Daniel Z. Freedman. Wikipedia
“The gravitational force is the oldest force known to man and the least understood.”
[P. Van Nieuwenhuizen, Supergravity, Volume 68, Issue 4 of Physics reports, North-Holland Pub. Co., 1981, 4]