Fix broken link

book/Pedagogy/Nos.md

@@ -124,7 +124,7 @@ An explanation has no value unless it fits the observations. It is stronger if i
 The concept of scientific proof is tricky. You cannot prove Hooke's law in the same way as the Pythagorean theorem: the latter requires no observations. Moreover, from a finite number of observations you can never logically draw an inference about all the observations yet to come: this is called the 'problem of induction'. Nevertheless, the validity and reliability of the observations in a study contribute to the quality of the conclusion.
 
 As a teacher, the art is in properly assessing when and with which students you can go deeper into a particular feature of NoS. If you are open to it, very useful conversations can arise. For example, discuss that an "experiment" is by definition an investigation in which variables are controlled (i.e., held constant). Such experiments are crucial in physics and chemistry, but in astronomy or paleontology there are other methods of investigation as well. Students may think that scientific knowledge can only be gained from experimental research, but there are all kinds of acceptable scientific research, experiments are only one form. 
-Especially for those who command Dutch: For more engaging and often philosophical questions about NoS that you can use directly in the classroom, check out the Flemish website <a href="www.wetenschapsreflex.be" target="_blank">www.wetenschapsreflex.be</a>.
+Especially for those who command Dutch: For more engaging and often philosophical questions about NoS that you can use directly in the classroom, check out the Flemish website <a href="http://www.wetenschapsreflex.be/" target="_blank">http://www.wetenschapsreflex.be</a>.
 
 And if you want to talk to your students about stereotypes (Why do so many people think science is mainly for white men?), <a href="https://www.nieuwezijds.nl/boek/ongekend/auteur/" target="_blank">Margriet van der Heijden's book "Ongekend"</a> gives fascinating insights into how women were often systematically opposed and how their important contributions to science were forgotten.