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Amazon’s marketing strategy is a little off-beat here, as past ads have featured random actors on the beach or confused Kindle owners testing out the Mayday feature. The company is also getting aggressive by showing the lack of voice support on Roku, although comparing competing products in advertisements is nothing new for the Seattle online retailer.

Amazon’s fellow?Seattle-area tech giant?Microsoft, for example, used the stack-rank practice for many years, rating employees on a fixed curve, which had the effect of giving a lower standing and compensation to some employees even in cases where their managers might have felt they deserved more.

Among the nine runners-up of this year's Breakthroughs is the discovery of the 160,000-year-old fossil of a Denisovan jaw in the Qinghai-Tibet Plateau in China. More than 34,000 Science magazine readers picked up the work done by Chinese and German scientists as the top breakthrough of 2019 for People's Choice.

Among others, it expects sales of electric vehicles, plug-in hybrids and fuel cell-powered cars in the country to reach 2 million by 2020, and such cars are to account for 20 percent of all vehicle sales by 2025.

Ammonia, composed of hydrogen and nitrogen, is already produced en masse from fossil fuels and exported worldwide to make fertilizer. It maintains a liquid state at around minus 33 C, meaning it is much simpler and cheaper to transport than liquid hydrogen at minus 253 C.