Abstract: The current expansion rate of the Universe is captured by the so-called Hubble constant, which is a key parameter in the, extremely successful,  standard model of cosmology.  As such, The Hubble constant  can be measured in several different ways: looking at the light of the “early Universe”, looking at bright objects in the “late Universe” (an approach close to  Hubble original approach) and  other in-between  options. These are like readings of different speedometers, each  measuring the speed of expansion of the Universe in its peculiar way. Each of these measurements is very precise:  error-bars are at the percent level. However,  their values do not seem to agree too well. These are exquisitely sophisticated, and challenging  measurements. Yet one may ask:  can this be a signature that the cosmological model starts showing some cracks and  that we might need to invoke new physics?  I will introduce this modern-day cosmic puzzle,  discuss  its implications, what this tension has taught us so far  and possible future prospects.