Sean Carroll on the arrow of time.
We’ve all heard earthquakes described in terms of their magnitude number. But what does this scale really mean? This video illustrates the variation of energy released in easy-to-understand terms.
We can send satellites in the orbit and people to the Moon and predict solar eclipses thousands the years into the future but yet we cannot reliably predict the weather…
Gav and Dan blow up paint tins in what easily is the messiest and bloodiest episode ever.
Does your toilet water drain differently than in the other hemisphere? Is it because of the Coriolis effect? Hank has some things to clarify about these questions, and more in this edition of I Don’t Think It Means What You Think It Means.
Fran Scott shows us how you can make your own Van de Graaff using household objects. How big a spark can you create?
Boiling water at various altitudes on the trek from Lukla to Everest Base Camp.
The Higgs mechanism is meant to account for the mass of everything, right? Well no, only the fundamental particles, which means that electrons derive their mass entirely from the Higgs interaction but protons and neutrons, made of quarks, do not. In fact the quark masses are so small that they only make up about 1% of the mass of the proton (and a similar fraction of the neutron). The rest of the mass comes from the energy in the gluon field. Gluons are massless, but there is so much energy in the field that by E=mc^2 there is a significant amount of mass there. This is where most of your mass comes from and the mass of virtually everything around you.
Particles come in pairs, which is why there should be an equal amount of matter and antimatter in the universe. Yet, scientists have not been able to detect any in the visible universe. Where is this missing antimatter? CERN scientist Rolf Landua returns to the seconds after the Big Bang to explain the disparity that allows humans to exist today.
Science is working tirelessly night and day to disprove its own theories about how the universe works (or at least, that’s what science thinks it’s doing). Hank tells us a quick history of how we came to create and adopt the scientific method and then gives us a vision of the future of science (hint: it involves a lot more computers and a lot less pipetting).
An atom is mostly empty space, but empty space is mostly not empty. The reason it looks empty is because electrons and photons don’t interact with the stuff that is there, quark and gluon field fluctuations.
Dr. Michio Kaku explains one theory behind déjà vu and asks, “Is it ever possible on any scale to perhaps flip between different universes?”
Jetpacking was awesome fun! Despite the fat lip I had a great time. I think knowing a bit about physics actually helps fly the jetpack. It works on the same principle as a rocket (Newton’s 3rd law) but unlike the shuttle, you don’t carry your own propellant with you. Instead, water is pumped out of the lake by the jetski at up to 60 litres a second. It is then fired out of the nozzles at around 15 m/s creating 1800 N of force, the equivalent of about 150 fire extinguishers. On me this can produce acceleration of about 1.5g’s.