  I present the first evidence of multiple populations in the globular cluster
(GCs) 47Tucanae based on images collected with the near-infrared camera
(NIRCam) on board the James Webb Space Telescope (JWST). While NIRCam
photometry is poorly sensitive to multiple populations among stars brighter
than the main-sequence (MS) knee, the M-dwarfs more-massive than 0.1 solar
masses define a wide F115W-F322W2 color range due to multiple populations. The
star-to-star color differences are mostly due to the different amounts of water
vapor (hence oxygen) that affect the spectra of M-dwarfs. The chromosome map
unveils an extended first population (1P) composed of M-dwarfs with different
metallicities and three main groups of second-population (2P) stars that are
depleted in oxygen with respect to the 1P. I present the discovery of an MS of
very-low-mass stars (masses smaller than 0.1 solar masses) and tentatively
associated it with a sequence composed of O-rich stars alone.
