user: how does an electric car work

assistant: Electric cars work by receiving energy from the battery, which is converted into power by an electric motor. The power is converted from the DC battery to AC for the electric motor. When an accelerator is pressed, it sends signal to the controller which adjusts the vehicle's speed by changing the frequency of the AC power from the inverter to the motor. Since the electric car gets is power from the battery, it usually consists of a rechargeable battery and doesn't contain liquid fuel components like fuel pump or fuel tank etc. This also makes the electric cars emit no exhaust.

user: Is Clivina bipustulata a beetle?

assistant: Yes, it is a species of ground beetle.

user: How large a cluster can Spark scale to?

assistant: Many organizations run Spark on clusters of thousands of nodes. The largest cluster we know has 8000 of them. In terms of data size, Spark has been shown to work well up to petabytes. It has been used to sort 100 TB of data 3X faster than Hadoop MapReduce on 1/10th of the machines, winning the 2014 Daytona GraySort Benchmark, as well as to sort 1 PB. Several production workloads use Spark to do ETL and data analysis on PBs of data.