Variable length data packets are encapsulated by adding an Asynchronous Transfer Mode compatible, five octet long packet header to each data packet. The decay is monitored by a testing circuit such as a comparator. The video game provides an engaging, enjoyable experience for the user. The rotated optical signals are collected at a receiver and corrected for errors using, for example, forward error correction. The unfolded PrPSc is contacted with a binding partner and the occurrence of binding indicates the presence of PrPSc in the sample. Namely, the flocculant is a polymeric flocculent which contains a copolymer having alkoxyalkyl units or a poly unit and further having water-soluble monomer units; and the method of sludge dewatering includes adding the polymeric flocculant to a sludge after or without adding an inorganic flocculent or an organic cationic compound thereto and then dewatering the sludge.