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But spy-agencies and law-enforcement have created a bustling marketplace for “zero-days,” which are weaponised for the purpose of attacking the computers and networks of “bad guys”. The incentives have shifted, and now a newly discovered bug had a good chance of remaining unpatched and live in the field because governments wanted to be able to use it to hack their enemies.

Last year, when I finished that talk in Seattle, a talk about all the ways that insecure computers put us all at risk, a woman in the audience put up her hand and said, “Well, you’ve scared the hell out of me. Now what do I do? How do I make my computers secure?”And I had to answer: “You can’t. No one of us can. I was a systems administrator 15 years ago. That means that I’m barely qualified to plug in a WiFi router today. I can’t make my devices secure and neither can you. Not when our governments are buying up information about flaws in our computers and weaponising them as part of their crime-fighting and anti-terrorism strategies. Not when it is illegal to tell people if there are flaws in their computers, where such a disclosure might compromise someone’s anti-copying strategy.But: If I had just stood here and spent an hour telling you about water-borne parasites; if I had told you about how inadequate water-treatment would put you and everyone you love at risk of horrifying illness and terrible, painful death; if I had explained that our very civilisation was at risk because the intelligence services were pursuing a strategy of keeping information about pathogens secret so they can weaponise them, knowing that no one is working on a cure; you would not ask me ‘How can I purify the water coming out of my tap?’”

Because when it comes to public health, individual action only gets you so far. It doesn’t matter how good your water is, if your neighbour’s water gives him cholera, there’s a good chance you’ll get cholera, too. And even if you stay healthy, you’re not going to have a very good time of it when everyone else in your country is striken and has taken to their beds.If you discovered that your government was hoarding information about water-borne parasites instead of trying to eradicate them; if you discovered that they were more interested in weaponising typhus than they were in curing it, you would demand that your government treat your water-supply with the gravitas and seriousness that it is due.The public health analogy is suprisingly apt here. The public health threat-model is in a state of continuous flux, because our well-being is under continuous, deliberate attack from pathogens for whom we are, at best, host organisms, and at worst, dinner. Evolution drives these organisms to a continuously shifting array of tactics to slide past our defenses.Public health isn’t just about pathogens, either – its thorniest problems are about human behaviour and social policy. HIV is a blood-borne disease, but disrupting its spread requires changes to our attitudes about sex, pharmaceutical patents, drugs policy and harm minimisation. Almost everything interesting about HIV is too big to fit on a microscope slide.

And so it is for security: crypto is awesome maths, but it’s just maths. Security requires good password choice, good password management, good laws about compelled crypto disclosure, transparency into corporate security practices, and, of course, an end to the governmental practice of spending $250M/year on anti-security sabotage through the NSA/GCHQ programmes Bullrun and Edgehill.

But for me, the most important parallel between public health and internet security is their significance to our societal wellbeing. Everything we do today involves the internet. Everything we do tomorrow will require the internet. If you live near a nuclear power plant, fly in airplanes, ride in cars or trains, have an implanted pacemaker, keep money in the bank, or carry a phone, your safety and well-being depend on a robust, evolving, practice of network security.This is the most alarming part of the Snowden revelations: not just that spies are spying on all of us – that they are actively sabotaging all of our technical infrastructure to ensure that they can continue to spy on us.There is no way to weaken security in a way that makes it possible to spy on “bad guys” without making all of us vulnerable to bad guys, too. The goal of national security is totally incompatible with the tactic of weakening the nation’s information security.

“Virus” has been a term of art in the security world for decades, and with good reason. It’s a term that resonates with people, even people with only a cursory grasp of technology. As we strive to make the public and our elected representatives understand what’s at stake, let’s expand that pathogen/epidemiology metaphor. We’d never allow MI5 to suppress information on curing typhus so they could attack terrorists by infecting them with it. We need to stop allowing the NSA and GCHQ to suppress information on fixing bugs in our computers, phones, cars, houses, planes, and bodies.If GCHQ wants to improve the national security of the United Kingdom – if the NSA want to impove the American national security – they should be fixing our technology, not breaking it. The technology of Britons and Americans is under continuous, deadly attack from criminals, from foreign spies, and from creeps. Our security is better served by armouring us against these threats than it is by undermining security so that cops and spies have an easier time attacking “bad guys.”

Every year of the conflict has seen an exponential growth in refugees. In 2012, there were 100,000 refugees. By April 2013, there were 800,000. That doubled to 1.6 million in less than four months. There are now three million Syrians scattered throughout the region — an increasing number that will soon surpass Afghans as the world's largest refugee population. At this rate, the UN predicts there could be four million Syrian refugees by the end of this year — the worst exodus since the Rwandan genocide 20 years ago.

The lack of clean water and sanitation in crowded, makeshift settlements is an urgent concern. Diseases like cholera and polio can easily spread — even more life-threatening without enough medical services. In some areas with the largest refugee populations, water shortages have reached emergency levels; the supply is as low as 30 liters per person per day — one-tenth of what the average American uses.

According to the U.N., more than half of all Syrian refugees are under the age of 18. Most have been out of school for months, if not years.

In December 2013, the U.N. issued its largest ever appeal for a single crisis — according to their estimates, $6.5 billion is necessary to meet the needs of all those affected by the crisis, both inside and outside Syria, an increase from last year's $5 billion. Yet that previous appeal was only 62 percent funded.