The Brain of Morbius

The Brain of Morbius is the fifth serial of the 13th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 3 January to 24 January 1976. The on-screen writer credit is given to Robin Bland, a pseudonym for script writer Terrance Dicks and then current Doctor Who script editor Robert Holmes. It is the first serial to feature the Sisterhood of Karn, which also featured in the 2013 mini-episode "The Night of the Doctor" and later in 2015's "The Magician's Apprentice".

Plot summary

On the planet Karn, an insect-like alien crawls away from an escape pod. It is ambushed and killed by Condo, a large man with a hook for a hand, who takes its head to a castle and his master Solon. However, the head is unsuitable — Solon needs a head from a warm-blooded humanoid.

The TARDIS materializes in the middle of a lightning storm, and the Fourth Doctor rushes out, ranting at the Time Lords for diverting him to this planet. Sarah suggests that perhaps the TARDIS malfunctioned again, but the Doctor is insistent there is something going on which the Time Lords do not want to sully their hands with.

IP

IP may refer to:

Computing

Biology and medicine

Other uses

I2P

The Invisible Internet Project (I2P) is an overlay network and darknet that allows applications to send messages to each other pseudonymously and securely. Uses include anonymous Web surfing, chatting, blogging and file transfers. The software that implements this layer is called an I2P router and a computer running I2P is called an I2P node.

The software is free and open source and is published under multiple licenses. The name I2P is derived from Invisible Internet Project, which, in pseudo-mathematical notation, is represented as I²P.

Technical design

I2P is beta software since 2003. Developers emphasize that there are likely to be bugs in the software and that there has been insufficient peer review to date. However, they believe the code is now reasonably stable and well-developed, and more exposure can help development of I2P.

The network itself is strictly message-based (like IP), but there is a library available to allow reliable streaming communication on top of it (similar to TCP, although from version 0.6 there is a new UDP-based SSU transport). All communication is end-to-end encrypted (in total there are four layers of encryption used when sending a message), and even the end points ("destinations") are cryptographic identifiers (essentially a pair of public keys), so that neither sender nor recipient of a message need to reveal their IP address to the other side or to third-party observers.

IP address

An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. An IP address serves two principal functions: host or network interface identification and location addressing. Its role has been characterized as follows: "A name indicates what we seek. An address indicates where it is. A route indicates how to get there."

The designers of the Internet Protocol defined an IP address as a 32-bit number and this system, known as Internet Protocol Version 4 (IPv4), is still in use today. However, because of the growth of the Internet and the predicted depletion of available addresses, a new version of IP (IPv6), using 128 bits for the address, was developed in 1995. IPv6 was standardized as RFC 2460 in 1998, and its deployment has been ongoing since the mid-2000s.

IP addresses are usually written and displayed in human-readable notations, such as 172.16.254.1 (IPv4), and 2001:db8:0:1234:0:567:8:1 (IPv6).