In defence of the black cab, if there is any sort of surge pricing in Uber, the black cab is typically cheaper if you can find one. Apps like Gett solve the ‘not knowing the price upfront’ problem, prebooking and hailing.
I think black cabs are a lot easier if you have lots of luggage, or especially if you have a pram/stroller. Rearward facing seats are safer for kids and cabs seat six comfortably. And the final big advantage: in London, black cabs get to use the bus lanes which can save inordinate amounts of time at rush hour.
I still use Uber all the time but I just thought I would add some balance!
AS01-adjuvanted shingles (herpes zoster) vaccination is associated with a lower risk of dementia, but the underlying mechanisms are unclear. In propensity-score matched cohort studies with 436,788 individuals, both the AS01-adjuvanted shingles and respiratory syncytial virus (RSV) vaccines, individually or combined, were associated with reduced 18-month risk of dementia. No difference was observed between the two AS01-adjuvanted vaccines, suggesting that the AS01 adjuvant itself plays a direct role in lowering dementia risk.
This is a really interesting idea and the unit economics are great. However when I researched this (or rather Gemini 2.5 Pro researched this) the problem appears that Haber-Bosch produces ammonia, whereas Birkeland-Eyde produces nitrate, which then needs to be converted in nitric acid. Getting from nitric acid to ammonium nitrate (which dominates the fertiliser market) needs ammonia from somewhere, which destroys the economics.
However calcium nitrate, potassium nitrate production via B-E looks really interesting.
I may be being dense, and I realise this is a meta analysis, but the abstract doesn’t explain how much fibre one needs to eat to reduce all-cause mortality by the amount they claim?
Thanks. I would still be curious to know how the strength of an artificial magnetic field at a range of say 10 km compares to the order of magnitude of local variations they are talking about in the earth’s magnetic field.
Agree. My mother had a very serious form of cancer (she’s luckily responded well to treatment) but she was overwhelmed by con men promising hope. Adding legitimate research makes this mix less toxic, not more
I wonder if a big part of the problem is that depression and other mental illnesses are slightly unusual in that they are categorised based on symptoms rather than underlying biology, which are poorly understood. As a diagnosis it’s about as useful as ‘chest pains’
Maybe (I am not a clinical psychiatrist) there are 1, 10, or 100 very different underlying causes which would indicate different treatment if only they were better understood. But nonetheless the existing classification / ontology is established and will be hard to displace.
Disagree. Firstly there aren’t many situations in fluid dynamics where there is a steady constraint on mass flow. Velocity just increases. (The exception is choked flow from a nozzle IIRC)
Now think about what happens when 6000 people/hr leave the station but arrive on 12 trains over the course of the hour, i.e. in surges. Each peak demand will comfortably exceed the flow rate of escalator.
You get a queue; the equivalent in fluid dynamics would be an increase in density upstream of a choked nozzle at Mach 1 but how to turn that into a relevant metric for eg queue length?
Thats also the reason - I suspect - that in many Tube stations two escalators go up and only one goes down.
However what does detract from this point somewhat is that this neglects relative purchasing power. At purchasing power parity, Russia's military spending is actually higher than perhaps people realise.
It’s a fun fact but I’d challenge whether it was the case in Anglo-Saxon education. Do you have a source? The Anglo-Saxons definitely had an early ampersand. I don’t know of any source where they give it a name. It’s still plausible they recited the alphabet in this way.
But the practice of reciting ‘and, per se, and’ is only attested in England and the US in the 19th century as far as I’m aware, and that’s where the corruption came from.
This sounds interesting. You sound like you work in nuclear physics. Please can you explain, or link to an explanation of, divertor (sic?) and strike point materials?
For anyone who’s ever tried building a robotic bird, there is a lot more intricacy to how birds fly than just “pushing air”. A better article might have been, ‘we still don’t understand how certain species of bird fly so efficiently’
I’m not sure I fully agree. Do you not get this trailing edge vortex with an asymmetrical aerofoil at 0 angle of attack? (Just less strongly because less pressure difference between suction and pressure sides)
I think black cabs are a lot easier if you have lots of luggage, or especially if you have a pram/stroller. Rearward facing seats are safer for kids and cabs seat six comfortably. And the final big advantage: in London, black cabs get to use the bus lanes which can save inordinate amounts of time at rush hour.
I still use Uber all the time but I just thought I would add some balance!