Every investment carries a risk. This is true about "learning the London streets", too. Especially in the era of ubiquitous GPS-enabled mobile phones. Assuming

Every investment carries a risk. This is true about "learning the London streets", too. Especially in the era of ubiquitous GPS-enabled mobile phones. Assuming your conjectured startup somehow conferred the medical skills you would have just found a great way to lower everyone's medical bills.