Line breaks in R Markdown text (not code blocks)

Question

Using the tufte_template rmarkdown file, I am trying to make a new paragraph (like \\newthought{}, but no caps.) I use two spaces, denoted here by *:

Answer 1

I tried these tests, it seems to be working:

test.Rmd

---
output: pdf_document
---

# test 1
No spaces used   

line1
line2


# test 2
2spaces at the end of line1  

line1  
line2

# test 3
2spaces at the end of line1, then 2 spaces on next line

line1  

line2

sessionInfo()
R version 3.2.0 (2015-04-16)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United Kingdom.1252   
[3] LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C                           
[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] htmltools_0.2.6 tools_3.2.0     yaml_2.1.13     rmarkdown_0.5.1 digest_0.6.8