Top 100 presentations

1. Continuous Verb Tenses
   35360
2. Support and transport in plants
   33850
3. Anyong Tubig Anyong Lupa sa Asya
   29314
4. Elements compounds and mixtures
   26030
5. Chromosome
   22018
6. Simple Verb Tenses
   20797
7. Atomic Structure
   20235
8. Balancing Chemical Equations. Balancing redox equations
   20150
9. Periodic Behavior
   19904
10. Newton’s laws of motion
    18877
11. Periodic Trends
    16754
12. Adverbs
    16645
13. Percent Composition, Empirical and Molecular Formulas
    15982
14. Animal Farm
    15793
15. Bonding, Molecular Shape & Structure
    14737
16. Circulation and Gas Exchange
    13467
17. MakingFood
    13403
18. DNA - An overview
    13081
19. Fungi
    12882
20. Atomic Structure and Periodic Trends
    12876
21. Volumetric
    12672
22. Feminism- Cure or Curse
    12552
23. Atomic Structure and Periodicity
    12510
24. Hormones and the Endocrine System
    12143
25. Animal Development
    12083
26. Derivation Applications of Bernoulli Principal
    11907
27. Osmoregulation and Excretion
    11485
28. Plasma Membrane-Gateway to the Cell
    10790
29. Plant Structure, Growth, and Development
    10755
30. Acid, bases and salts
    10272
31. Development
    10213
32. Mirrors and Lenses
    10170
33. Structure of the Atom
    9936
34. Balanced forces
    9910
35. Ancient Civilizations
    9824
36. Mass Spectrometry
    9762
37. Pronouns
    9735
38. Nouns
    9678
39. Resource Acquisition and Transport in Vascular Plants
    9499
40. Forests
    9391
41. Support and transport in plants
    9352
42. Atomic Structure
    9307
43. Cell Types and Cell Structure
    8988
44. Newton’s third law of motion
    8937
45. Animal Nutrition
    8701
46. Transplantation Immunology
    8635
47. Cellular respiration
    8506
48. Growing Plants
    8364
49. Sensory and Motor Mechanisms
    8341
50. Electrical Circuits
    8256
51. Plant Responses to Internal and External Signals
    8190
52. Lab Equipment
    8035
53. Prepositions
    7989
54. Viruses, Viroids, and Prions
    7889
55. Neurons, Synapses, and Signaling
    7887
56. Of Mice and Men
    7817
57. A Tour of the Cell
    7729
58. Basic Structure of a Cell
    7662
59. Real time PCR and it's functions in diagnosis
    7620
60. Covalent Bonding (Molecules)
    7588
61. Plant structure adaptations and responses
    7546
62. Ionic Bonding
    7454
63. Cellular Division
    7437
64. Mendelian Genetics
    7094
65. To Kill a Mockingbird
    7067
66. Blood Type Genetics
    7028
67. Satellite Orbits and Uses NIS
    7025
68. Molecules and Ions
    6922
69. Sound
    6912
70. Well logging The Bore Hole
    6903
71. The Immune System
    6839
72. Membrane Structure and Function
    6770
73. Animal Reproduction
    6721
74. The Chemistry of Acids and Bases
    6668
75. Angiosperm Reproduction and Biotechnology
    6666
76. Rocks
    6607
77. Mendel and the Gene Idea
    6595
78. Plant Diversity
    6594
79. Cell Communication
    6549
80. Balancing Chemical Equations
    6500
81. Rate Laws
    6362
82. Drama
    6325
83. Introduction to Oscillations and Simple Harmonic Motion
    6317
84. Hybridization of Orbitals
    6313
85. The Building Blocks of Matter Atoms
    6250
86. Empirical Formula
    6213
87. Electron Quantum Numbers
    6172
88. An Introduction to Metabolism
    6146
89. Translation. Protein from RNA
    6089
90. Neurons
    6034
91. The Structure and Function of Large Biological Molecules
    5972
92. The Mole
    5907
93. Photosynthesis
    5905
94. Cell Membrane + Tissues & Organs Definitions
    5879
95. Earthquakes
    5840
96. Karyotypes
    5836
97. ADP, ATP and Cellular Respiration
    5804
98. Endocrine System
    5753
99. Classical greek philosophy
    5694
100. Population Ecology
     5653

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)