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Danny Thorpe
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Surfing BigData Analytics in Looker VR
Warning: Silliness Ahead!

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Interesting research paper reviewing multiple studies of contaminants in rooftop collected rainwater.  Notice that rainwater collected before contact with the roof surface already has non-trivial amounts of some metals!  

The paper also makes a valid point that while EPA standards specify recommended concentration limits for some metals such as Aluminum and Zinc, these are secondary standards affecting water taste or clarity, not actual health hazards.

My conclusion: If you plan to use rainwater harvesting as a source of potable drinking water, you should plan on installing a water filtration and disinfection system just as you would for any other surface water capture system. Dissolved zinc in water collected from a galvanized metal roof system is not toxic to humans, but can affect water taste, and can be significantly knocked down by normal water filtration processes.  

Note that since zinc is an antibacterial/antifungal agent, an aquaponic system using captured rainwater will have much lower tolerance for dissolved zinc than EPA standards for human drinking water. With sufficient water treatment (ozonation + filtration, perhaps), rainwater can be used for aquaponics and for potable water systems. As with any water source, it's just a matter of how much effort you want to put into it. 

Note to self: never install network equipment on the western wall of an non-airconditioned non-insulated workshop.  Network failures from 1pm to 5pm every day for the past week.

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Airbus unveils hypersonic aircraft design concept to travel Paris - New York in 1 hour. 3500 mph, mach 5 at 115,000 ft
iDigitalTimes: Airbus Hypersonic Jet Flies London To New York In 1 Hr: See How Hyperjet Reaches Mach 5 [VIDEO] http://google.com/newsstand/s/CBIw7_yCoCM

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If you noticed bitcoin testnet went a little nuts over the weekend, here's the back story.

TL;DR:  Testnet is a crucible that mimics the bitcoin main network, but with greater opportunity for extremes (and deliberately so). Testnet is supposed to be a little chaotic so that bitcoin services can be tested under difficult or hostile conditions that are rare on the normal bitcoin block chain, to ensure that the services don't fall over at the first sign of turbulence in the bitcoin main network.

Yes, testnet's forkfest / orphan block storm is much more extreme than we should ever see in the bitcoin blockchain, but testnet uses exactly the same block fork / orphan protocol as the main bitcoin blockchain so any service that can properly handle these occasional testnet forkfests will be rock solid for the relatively tame main blockchain.

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