Problem: Compression is useful because it helps reduce resource usage, such as data storage space or transmission capacity. Because compressed data must be decompressed to use, this extra processing imposes computational or other costs through decompression; this situation is far from being a free lunch. Data compression is subject to a spacetime complexity trade-off. For instance, a compression scheme for video may require expensive hardware for the video to be decompressed fast enough to be viewed as it is being decompressed, and the option to decompress the video in full before watching it may be inconvenient or require additional storage. The design of data compression schemes involves trade-offs among various factors, including the degree of compression, the amount of distortion introduced (when using lossy data compression), and the computational resources required to compress and decompress the data.
What must be decompressed?
The answer is the following: compressed data

Problem: Initially the existing 5:3 aspect ratio had been the main candidate but, due to the influence of widescreen cinema, the aspect ratio 16:9 (1.78) eventually emerged as being a reasonable compromise between 5:3 (1.67) and the common 1.85 widescreen cinema format. An aspect ratio of 16:9 was duly agreed upon at the first meeting of the IWP11/6 working party at the BBC's Research and Development establishment in Kingswood Warren. The resulting ITU-R Recommendation ITU-R BT.709-2 ("Rec. 709") includes the 16:9 aspect ratio, a specified colorimetry, and the scan modes 1080i (1,080 actively interlaced lines of resolution) and 1080p (1,080 progressively scanned lines). The British Freeview HD trials used MBAFF, which contains both progressive and interlaced content in the same encoding.
Which encoding contains both progressive and interlaced content?
The answer is the following: MBAFF

Problem: The most widely used class of antenna, a dipole antenna consists of two symmetrical radiators such as metal rods or wires, with one side of the balanced feedline from the transmitter or receiver attached to each. A horizontal dipole radiates in two lobes perpendicular to the antenna's axis. A half-wave dipole the most common type, has two collinear elements each a quarter wavelength long and a gain of 2.15 dBi. Used individually as low gain antennas, dipoles are also used as driven elements in many more complicated higher gain types of antennas.
What radiates two lobes perpendicular to the antennas axis?
The answer is the following: horizontal dipole

Problem: The first record of the existence of a settlement at Plymouth was in the Domesday Book in 1086 as Sudtone, Saxon for south farm, located at the present day Barbican. From Saxon times, it was in the hundred of Roborough. In 1254 it gained status as a town and in 1439, became the first town in England to be granted a Charter by Parliament. Between 1439 and 1934, Plymouth had a Mayor. In 1914 the county boroughs of Plymouth and Devonport, and the urban district of East Stonehouse merged to form a single county borough of Plymouth. Collectively they were referred to as "The Three Towns".
In what year was the Domesday Book compiled?
The answer is the following:
1086