Besides that, most people feel a real keyboard just takes up to much space. A phone is not meant to program the next OS or write a book. It is a way of interacting with the world and nowadays that means much more reading and viewing as it does typing.
No I am not on twitter, let alone addicted to it. Most of the things I type on my phone are more than 140 characters.
1. Generic porn sites tend to also have a far higher frequency of adware and malware content than normal.
Then they should also block relegious sites because they seem to contain more malware
Boy am I glad that I didn't break my leg last year. Netflix isn't here that long. Finally I have time to watch some shows that I just didn't get to previously.
If you have it and you want to use another wifi, first login with incorrect credentials. If that gains you access then you can't trust the network.
Most people wont do that, so there will probably be no protection (assuming the normal ISP incompetence). Comcast should build a special login program for such things. It can solve the problem in 2 ways:
1. It could first try to contact the server and verify the connection. If it is a true Xfinity connection then it is reasonably safe. If it is not then the client should not connect to the system. This is probably a custom system based on not-yet build programs and thus a lot of work.
2. It could avoid the problem all together: don't set up a normal connection. Instead, set up a secure VPN connection. Encrypt the complete stream through the potentially unsafe hotspot. This would require Comcast servers providing those thousands of secure VPN connections.
3. Something else thought up by someone smarter than me.
Probably they didn't do anything and if someone does sets up such a honeypot it may cost them a lot of money.
In the end politics will meddle with it, and protecting jobs is popular (despite environmental costs).
With the 3 hours of solar boating we'd have 20 hours a day of clean shipping. Since required power is approximately related to speed squared, having a bit lower speed would offer a lot less fuel usage. Low speed is already a disadvantage, but with moder consumer wishes a "Sustainable inter continental shipping" logo splashed everywhere would probably increase sales for your customers. Maybe DHL could advertise long delivery time green shipping thing.
To get back on topic: Batteries. Large container ships are meant for long distances, so we can assume the ship will be on the ocean for months at a time.
If I assume lithium sulfur batteries have a voltage of 3.5 V (from Li-Ion batteries) I assume 3.5 Wh/g or 12,600J. We need about 30,100,000,000J/day so that's 2,388,888 g or 2.4 metric tons. To go 3 months you'd need 223.2 metric tons of these new batteries.
Container ships are big, in the order of 50.000 metric tons so it would be possible. However the price of these batteries isn't known yet and it may just be more expensive than a skysail and a deck of solar panels.
With this back of the envelope calculations I think now that the solution would be in the category of SkySail + solar panels + batteries. Cruise on SkySail + batteries and top the batteries off with the solar panels if you can.
As for the corrosive environment: Glass doesn't corrode and the rest can be covered in plastic which doesn't corrode either. They should be fully sealed of course so there are no metal parts in contact with the corrosive air.
I just think the maintenance crews aren't going to like it much. It would require a lot of retraining.
Note: I am an engineer. However I am not an experienced engineer in this field.
The only, but big, problem is safety and that can be partly mitigated by adaptive cruise control.
1)From the shipping dock onto a truck.
3)off the truck.
4)onto the train.
In a train oriented system this would be all 1 step for heavy cargo companies (postal service, postorder companies, supermarkets etc): From the dock onto the train.
5)wait for a train to be built.
6)wait for train to run.
How long this is depends on the usage. Here in the Netherlands passenger trains run once an hour like clockwork. Scheduling trains like that is possible, for cargo as well as passengers. Simple hint: never wait for cargo. If the cargo isn't at the dock or in the cart in time it'll have to wait for the next train. If trains are the standard this may only be an hour.
With modern control systems it may be possible to load the cargo onto a train cart, get the cart up to speed as the train passes and hook it on the end fully automated. This would mean the dock gets more expensive (linear motors in the tracks to get the carts (with magnets on the bottom) to speed) but this is only a small section and since the train doesn't even have to stop delays are minimized and power requirements are minimized.
7)off the train onto the trucks.
8)finally to the delivery dock.
If the destination is a company this could, in many cases be only a little bit because the shop or somesuch would be in the same area as the dock (or it may have a dock all for itself).
In fact, never ever throw a battery in a landfill. Most are quite bad for the environment when not recycled properly.