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Despite Lilienthal's fate, the brothers favored his strategy: to practice gliding in order to master the art of control before attempting motor-driven flight. The death of British aeronaut Percy Pilcher in another hang gliding crash in October 1899 only reinforced their opinion that a reliable method of pilot control was the key to successful—and safe—flight. At the outset of their experiments they regarded control as the unsolved third part of "the flying problem". They believed sufficiently promising knowledge of the other two issues—wings and engines—already existed.  The Wright brothers thus differed sharply from more experienced practitioners of the day, notably Clément Ader , Maxim and Langley who built powerful engines, attached them to airframes equipped with unproven control devices, and expected to take to the air with no previous flying experience. Although agreeing with Lilienthal's idea of practice, the Wrights saw that his method of balance and control by shifting his body weight was inadequate.  They were determined to find something better.
Residues of more than one pesticide were found in % of samples for the 2014 report. The presence of multiple residues does not constitute non-compliance with MRL legislation as long as individual pesticides do not exceed legal limits. However, products with multiple residues should be assessed carefully by the national authorities (for example, are combinations of pesticides being used deliberately to circumvent MRL limits on single substances?). EFSA did not consider cumulative risk assessment in its latest report because it is currently finalising a tool for assessing cumulative exposure to multiple pesticides . The tool is being piloted to investigate the cumulative effects of pesticides on the nervous system and the thyroid. The results will be published in 2017.