Question: What is the year of the event that occured first, The Trials of Life was transmitted, or The Five Obstructions was produced?

<P0-S0> The Trials of Life: A Natural History of Behaviour is a BBC nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 3 October 1990. <SEP> <P1-S0> Shital Mahajan Rane, is an Indian extreme sportsperson, skydiver and the holder of five world records and 14 National records in the sport. <P1-S1>  She is known as the first woman to perform first parachute jump of life without training over the Geographical North pole in minus 37 degree Celsius from 2400 ft, and first accelerated free fall jump without any trials over the Antarctica - South pole from 11,600 feet, in minus 38 degree Celsius the youngest woman to jump over both the North and South Poles, and the first woman jumper to perform it without trials. <P1-S2>  The Government of India honored Mahajan in 2011, with the fourth highest civilian award of Padma Shri. <SEP> <P2-S0> Spaced retrieval, also known as expanded retrieval or uniform retrieval, is a learning technique, which requires users to rehearse information to be learned at different and increasing spaced intervals of time or a set uniform amount of time. <P2-S1>  In testing this type of learning, people are instructed to rehearse a given set of information at a certain time, and each new rehearsal is expected to have a longer period of time between itself and the previous rehearsal or an equal amount of time between rehearsals. <P2-S2>  At the end of every trial period there is a test phase. <P2-S3>  Landauer and Bjork first studied this technique of learning in 1978. <P2-S4>  The study required participants to learn names from flash cards. <P2-S5>  Prior to learning participants were placed into five different rehearsal types: uniform short, uniform moderate, uniform long, expanding, and contracting. <P2-S6>  These all indicate the amount and spacing of trials between each test. <P2-S7>  Uniform trials involve a number of trials between each test stage, but the trial numbers are fixed (e.g. 2-test-2-test-2-test). <P2-S8>  Contracting rehearsals involve larger intervals of time between the first few trials and the test phase, but eventually the trials decrease in number. <P2-S9>  Expanding involves starting with trials and tests close together, and as they progress the person would have more time between each trial and test (e.g. 1-test-2-test-3-test). <P2-S10>  The effectiveness of the rehearsal types was measured by seeing how accurately participants responded during a test phase. <P2-S11>  Expanding was proven to be the most important because it produced the highest amount of recall during the test period. <SEP> <P3-S0> The Five Obstructions is a 2003 Danish documentary film directed by Lars von Trier and Jørgen Leth. <P3-S1>  The film is conceived as a documentary, but incorporates lengthy sections of experimental films produced by the filmmakers. <P3-S2>  The premise is that von Trier has created a challenge for his friend and mentor, Jørgen Leth, another renowned filmmaker. <P3-S3>  von Trier's favorite film is Leth's "The Perfect Human" (1967), and von Trier gives Leth the task of remaking "The Perfect Human" five times, each time with a different "obstruction" (or obstacle) imposed by von Trier.